Events, Verisoph

25 December 800 Charlemagne crowned Emperor by the Pope 0 cit. On Christmas Day, Pope Leo III placed an imperial crown on Charlemagne, king of the Franks, in St Peter's Basilica. It revived the idea of a Roman emperor in the West more than three centuries after the last one. Whether Charlemagne planned the coronation or was surprised by it is a long-running dispute; his biographer Einhard claimed he disliked the title, though many historians doubt this. diplomacy / politics / religion ●●●

c. 800 The Book of Kells 0 cit. The Book of Kells, an illuminated manuscript of the four Gospels in Latin, was produced by Columban monks around 800, probably begun on Iona and finished at Kells. Its intricate decoration marks the high point of insular Christian art. It survives today at Trinity College Dublin and stands as a symbol of early medieval Irish culture. culture / religion ●●

c. 800 Swahili city-states rise along the coast 0 cit. Trading towns grew where coastal Africans met merchants crossing the Indian Ocean, producing an urban, Muslim, stone-built culture and the Swahili language. Ports such as Mombasa, Malindi, Lamu, and the walled inland town of Gede were governed by their own patrician clans and, in several cases, sultans, tied to one another by trade and rivalry rather than a single empire. The towns rose gradually from about the eighth century, so the date is approximate. culture / economy / politics ●●●

802 Founding of the Khmer Empire 0 cit. Jayavarman II declared independence and founded the Khmer Empire in mainland Southeast Asia. The empire built the vast temple complex of Angkor. politics / religion ●●●●

c. 820 Al-Khwarizmi founds algebra and lends his name to the algorithm 0 cit. Al-Khwarizmi wrote a systematic book on solving equations whose Arabic title gave us the word algebra, meaning the restoring or balancing of terms. His name, latinized as Algoritmi, became our word algorithm, and his account of Hindu numerals helped spread them across the world. He treated equation-solving as a general method rather than a set of isolated tricks. science ●●●●

c. 827 Arab scholars translate and name the Almagest 0 cit. Scholars at the Abbasid House of Wisdom translate Ptolemy into Arabic; the book's familiar name, Almagest, comes from the Arabic al-majisti, 'the greatest'. Islamic astronomers preserved, corrected, and extended his work for centuries. religion / science ●●●

c. 830 The House of Wisdom flourishes in Baghdad 0 cit. Under the Abbasid caliphs, especially al-Ma'mun, Baghdad's House of Wisdom became a hub for translating and studying Greek, Persian, and Indian works. It advanced mathematics, astronomy, and medicine during the Islamic Golden Age. religion / science ●●●●

c. 830 House of Wisdom and the Islamic Golden Age 0 cit. In Baghdad the Abbasid caliphs sponsor a major translation and research effort often linked with an institution called the House of Wisdom. Scholars translate Greek, Persian, and Indian works and advance mathematics, medicine, and astronomy. The era anchors Islam's reputation as a carrier of learning. culture / religion / science ●●●

c. 830 The House of Wisdom gathers the world's learning in Baghdad 0 cit. Under Abbasid patronage, scholars in Baghdad translated Greek, Persian, and Indian works into Arabic and pushed them forward. The picture of a single grand library called the House of Wisdom is partly a modern simplification of a broader translation movement. Either way, this era preserved and advanced knowledge that Europe had largely lost. culture / science ●●

c. 835 The church sets All Saints' and All Souls' at the start of November 0 cit. The feast of All Saints was fixed on November 1 and All Souls' on November 2, overlapping the old season of the dead. The eve became All Hallows' Eve, later Halloween. religion / society ●●

August 843 Treaty of Verdun wikidata 0 cit. no story 843 treaty dividing the Frankish Empire between the grandsons of Charlemagne ●●●

c. August 843 Formation of France 0 cit. no story The Treaty of Verdun divides the Carolingian Empire and creates West Francia, the kingdom from which modern France developed. politics ●●●●

843 The Triumph of Orthodoxy restores the icons 0 cit. The Empress Theodora and a church council ended iconoclasm for good, confirming the veneration of icons first upheld at the Second Council of Nicaea in 787. The settlement fixed the visual and devotional character of Orthodox Christianity for centuries after. Its anniversary is still kept as the Feast of Orthodoxy. culture / religion ●●

843 The Treaty of Verdun splits the Carolingian Empire 0 cit. Charlemagne's grandsons divided his empire into three kingdoms. The eastern share, East Francia, grew into the German lands that would later carry the imperial title. The split set an early pattern for the fragmented map of central Europe. diplomacy / politics ●●

845 Great Anti-Buddhist Persecution 0 cit. Emperor Wuzong ordered the closure of monasteries and the seizure of Buddhist wealth in 845 CE. The campaign weakened institutional Buddhism, though the faith survived. politics / religion ●●●●

c. 850 Gunpowder 0 cit. Chinese alchemists mixed saltpeter, charcoal and sulfur into an explosive powder. Gunpowder led to firearms and cannon and changed warfare worldwide. technology / war ●●●●●

c. 850 Invention of gunpowder 0 cit. Chinese alchemists discovered gunpowder while seeking elixirs of immortality. It was gradually adapted for weapons and became a transformative technology. science / technology ●●●●●

c. 850 Abu Ma'shar carries astrology into Islam and Europe 0 cit. The Persian astrologer Abu Ma'shar (Albumasar) becomes the most influential astrologer of the Islamic Golden Age. His works, translated into Latin, carried Greek and Babylonian astrology into medieval Europe, where it was taught in the universities. religion / science ●●●

c. 850 The Anglo-Saxon witan advises the king 0 cit. Anglo-Saxon kings rule with a witan, a council of nobles and churchmen who advise on law, taxation, and the choice of king. It is not a parliament in the modern sense, but it establishes the idea that a English king should govern with the consent of leading men. politics ●●

c. 850 Manda becomes an Indian Ocean trading town 0 cit. On Manda, in the Lamu archipelago, an early Swahili town traded across the Indian Ocean, its harbour walls built of coral and its houses reached by imported Islamic and Chinese ceramics. Neville Chittick’s 1960s excavations showed it was one of the coast’s earliest stone-using ports. ●●

859 Al-Qarawiyyin is founded in Fez 0 cit. Fatima al-Fihri founded the mosque and school of al-Qarawiyyin in 859. It is often cited as one of the oldest continuously operating degree-granting institutions in the world. religion / science ●●●●

c. 862 Founding of Rus under Rurik 0 cit. According to the Primary Chronicle, the Varangian leader Rurik took power at Novgorod, an event later treated as the traditional starting point of the Rus state. The chronicle account is legendary and its details are debated by historians. politics / society ●●●●

863 Cyril and Methodius bring letters to the Slavs 0 cit. The Byzantine brothers Cyril and Methodius were sent to preach among the Slavs and devised an alphabet to write their tongue, translating scripture into Slavonic. The script they created is generally identified as Glagolitic; the later Cyrillic alphabet, named for Cyril, was most likely developed by their disciples in Bulgaria. Their mission spread Orthodox Christianity and a written culture across the Slavic world. culture / diplomacy / religion ●●●

c. 864 Bulgaria enters the Orthodox fold 0 cit. The Bulgarian ruler Boris I accepted Christianity from Constantinople rather than Rome, bringing his powerful Balkan state into the Orthodox and Byzantine cultural sphere. The choice, made after Boris weighed both churches, tied Bulgaria's church and script to the Greek east. It marked a major win in the long contest between Constantinople and Rome for the souls of eastern Europe. diplomacy / politics / religion ●●

c. 867 The Macedonian Renaissance revives Byzantine culture 0 cit. Under the Macedonian dynasty founded by Basil I the empire entered a long revival of power, wealth, and learning. Scholars copied and studied the classical Greek texts that later reached the west, and a refined art and scholarship flourished. This 'Macedonian Renaissance' preserved much of the ancient heritage that would feed later European culture. culture / politics / society ●●

869 to 883 The Zanj Rebellion 0 cit. Enslaved East Africans, known as the Zanj, rose in a massive revolt against the Abbasid Caliphate that lasted 14 years. It was one of the largest slave uprisings in history before it was crushed. society / war ●●●

12 August 870 Treaty of Meerssen wikidata 0 cit. no story treaty ●●●

874 to 884 Huang Chao Rebellion 0 cit. no story A huge rebel army under Huang Chao sacks both Tang capitals and massacres the merchant city of Guangzhou. The devastation fatally weakens the Tang dynasty. society / war ●●●

c. 880 Treaty of Alfred and Guthrum 0 cit. Pact between Alfred the Great of Wessex and the Viking king Guthrum defining the boundary between English and Danish rule. It formalized the Danelaw and set legal terms between the two peoples. diplomacy / politics / war ●●

c. 882 Oleg Moves the Capital to Kiev 0 cit. The Rus ruler Oleg is said to have seized Kiev and made it the center of his realm, linking Novgorod and Kiev under one dynasty. Kiev became the political heart of what is now called Kievan Rus. politics ●●●●

885 Bagratid kingdom restores Armenian statehood 0 cit. As the caliphate weakens, Ashot I of the Bagratid (Bagratuni) family is recognized as king, reviving an independent Armenian state after centuries of foreign rule. The Bagratid kingdom oversees a revival of trade, architecture, and church building. It marks the last major era of medieval Armenian independence in the homeland. politics / society ●●

c. 900 Classic Maya Collapse 0 cit. Around 900 CE many of the great Maya cities of the southern lowlands were abandoned and their dynasties ended. Monument building stopped and populations declined sharply across the region. culture / politics ●●●●

c. 900 to c. 1100 Golden Age of Jews in Muslim Spain 0 cit. Under Muslim rule in Iberia, Jewish communities took part in a flourishing of philosophy, poetry and science, often called a golden age. Figures such as Maimonides emerged from this Sephardic world. culture / religion ●●●

c. 900 Rise of the Toltec at Tula 0 cit. The Toltec built their capital at Tula in central Mexico. Later Mesoamerican peoples, including the Aztecs, revered them as a model civilization. culture / politics ●●●

c. 900 Saqaliba and the word slave 0 cit. Medieval traders moved so many Slavic captives, called saqaliba, into Islamic lands that the ethnic name became the root of the word slave in several European languages. The trade ran across central and eastern Europe for centuries. culture / society ●●●

c. 900 Vikings and the thrall trade 0 cit. Norse raiders seized captives across the British Isles and eastern Europe and sold them as thralls. Slave trading was a major part of the Viking economy alongside raiding and settlement. economy / society ●●●

c. 900 The Germanic feast of Yule blends into Christmas 0 cit. The midwinter feast of Yule was folded into Christmas as northern peoples became Christian, and the word Yule still means Christmas. Customs such as evergreens and the Yule log carried over. culture / religion ●●

c. 900 Feudal monarchy organizes medieval Europe 0 cit. Kings granted land to lords in exchange for military service and loyalty, and lords in turn bound lesser nobles and peasants below them. Power was spread through a chain of personal obligations rather than a central state. politics / society ●●●●

c. 900 The Merseburg Charms preserve a pagan German spell 0 cit. Two short spells written in Old High German, the Merseburg Charms, are the only surviving record of continental Germanic pagan incantation, naming Wodan and other gods. Almost everything else of that religion was erased by conversion. culture / religion ●●

c. 900 Islamic astronomers build modern trigonometry 0 cit. Scholars such as al-Battani and later al-Tusi turned the Greek chord tables into the sine, cosine, and tangent functions we still use. Driven by astronomy and the need to find the direction of Mecca, they made trigonometry a subject of its own. Their tables and identities passed into Europe and underpinned later navigation and astronomy. religion / science ●●●

c. 900 Jewish communities take root in the Rhineland 0 cit. Jewish traders and families settled in towns along the Rhine, drawn by bishops and rulers who wanted their commerce. These communities became the seed of Ashkenazi Jewry, a distinct branch named for Ashkenaz, the medieval Hebrew word for the German lands. Over the next century they built the synagogues, courts, and schools that would define Ashkenazi life for a thousand years. culture / religion / society ●●●

c. 900 The Swahili and the Indian Ocean monsoon trade 0 cit. The coastal towns lived by a seasonal trade carried on the monsoon winds, which brought dhows from Arabia, Persia, and India for part of the year and carried them home on the reverse wind. The coast sent out ivory, animal hides, mangrove poles, and gold that came up from ports further south, and took in cloth, beads, and porcelain. This exchange, running for many centuries, tied East Africa into a wide Indian Ocean world. diplomacy / economy ●●●

c. 900 Decline of the Kingdom of Aksum 0 cit. Aksum faded as a power after roughly the seventh century, losing its Red Sea trade as the rise of Islam shifted commerce and cut its ports off from old markets. Environmental strain, soil exhaustion, and the loss of coinage all played a part. The centre of the Christian kingdom drifted south into the highlands, setting the stage for later dynasties. economy / politics ●

907 Collapse of the Tang Dynasty 0 cit. In 907 CE the warlord Zhu Wen forced the last Tang emperor to abdicate, ending nearly three centuries of Tang rule. China broke apart into the rival regimes of the Five Dynasties and Ten Kingdoms. politics / war ●●●●

907 Collapse of the Tang and Five Dynasties 0 cit. The Tang dynasty fell in 907 CE, opening a period of fragmentation known as the Five Dynasties and Ten Kingdoms. Rival regimes competed until the Song reunified much of China. politics / war ●●●

909 Founding of the Fatimid Caliphate 0 cit. The Fatimids established a Shia caliphate in North Africa and later founded Cairo. At its peak it ruled from the Maghreb across Egypt to the Levant. politics / religion ●●●●

c. 911 Treaty of Saint-Clair-sur-Epte 0 cit. Agreement between King Charles the Simple of West Francia and the Viking leader Rollo, granting Rollo lands around Rouen in exchange for defense and baptism. It created what became the Duchy of Normandy. diplomacy / politics / war ●●●

933 Saadia Gaon defends reason in religion 0 cit. In the Book of Beliefs and Opinions, Saadia Gaon argued that reason and revelation agree and that the truths of faith can be shown by rational argument. Drawing on Islamic philosophy, he opened the medieval tradition of Jewish rationalism. religion / science ●●

c. 936 The Parsis carry the fire to India 0 cit. Zoroastrian refugees settle in India as the Parsis, keeping the faith alive for a thousand years. Their small community would later found great modern industrial houses such as Tata and Godrej, and produce figures from Freddie Mercury to Zubin Mehta. economy / religion ●●

August 955 Otto I defeats the Magyars at Lechfeld 0 cit. Otto I, king of the Germans, crushed a Magyar raiding army near Augsburg. The victory ended decades of steppe raids and made Otto the strongest ruler in the West. It set the stage for his claim to the imperial crown. politics / war ●●

960 Founding of the Song dynasty 0 cit. General Zhao Kuangyin founded the Song dynasty in 960 CE and reunified most of China. The Song brought economic growth, urbanization, and a flowering of science and culture. politics ●●●●●

c. 960 Hasdai ibn Shaprut, courtier of Cordoba 0 cit. Hasdai ibn Shaprut served the caliph Abd al-Rahman III as physician, diplomat, and customs official in Cordoba, then the largest city in western Europe. He used his position to patronize Hebrew scholarship and poetry, drawing scholars to al-Andalus. His career marks the start of what later writers called the Golden Age of Sephardic Jewry. culture / politics / science ●●●

c. 960 Dunash ben Labrat remakes Hebrew poetry 0 cit. The poet and grammarian Dunash ben Labrat adapted Arabic quantitative meter to Hebrew verse, giving Hebrew poetry a new music. Jewish poets in al-Andalus began writing not only sacred hymns but secular poems on wine, love, and friendship, in the style of their Arab neighbors. This fusion of Hebrew and Arabic culture defined the Golden Age. culture / science ●●

961 Ani becomes the Bagratid capital 0 cit. King Ashot III moves the Bagratid capital to Ani, which grows into a wealthy city on the Silk Road trade routes. Known as the city of a thousand and one churches, Ani is celebrated for its medieval Armenian architecture and may have held one hundred thousand people at its peak. Its ruins, now near the Turkey-Armenia border, are a UNESCO World Heritage site. culture / economy / religion ●●

962 Founding of the Holy Roman Empire 0 cit. Otto I was crowned emperor, linking the German kingship to the imperial title. The Holy Roman Empire remained a central institution in European politics for centuries. politics ●●●●

2 February 962 Otto I crowned Emperor, the empire's usual starting point 0 cit. Pope John XII crowned Otto I emperor in Rome, tying the German crown to the imperial title in a bond that lasted over 800 years. Most historians treat this coronation, rather than Charlemagne's, as the real beginning of the Holy Roman Empire. The state itself did not use the full name Sacrum Romanum Imperium until much later. diplomacy / politics / religion ●●●

c. 965 Unification of Denmark 0 cit. no story Harald Bluetooth unifies the Danish kingdom and converts it to Christianity, an event recorded on the Jelling stones. politics / religion ●●●

4 April 970 Founding of al-Azhar 0 cit. The Fatimids begin building the al-Azhar mosque in their new capital of Cairo, completed in 972. It grows into one of the world's oldest centers of Islamic learning and, after Egypt's return to Sunnism, the leading authority of Sunni scholarship. culture / religion ●●●

c. 970 Al-Azhar is founded in Cairo 0 cit. The Fatimids built the mosque of al-Azhar around 970 and soon began teaching there. It became a leading center of Islamic learning and remains influential today. politics / religion ●●●

c. 970 The imperial church system binds bishops to the crown 0 cit. The Ottonian emperors leaned on bishops and abbots as royal officials, granting them lands and appointing them directly. Churchmen owed loyalty to the emperor and helped govern the realm. This close grip on the Church would soon collide with a reforming papacy. politics / religion ●●

c. 988 Christianization of Kievan Rus 0 cit. Grand Prince Vladimir the Great adopted Byzantine Christianity and had the people of Kiev baptized, tying the Rus to the Orthodox world. Both modern Russia and Ukraine claim this conversion as a foundational moment in their national and religious histories. politics / religion ●●●●●

c. 988 Varangian Guard formed for the Byzantine emperor 0 cit. Byzantine Emperor Basil II received several thousand Scandinavian and Rus warriors from Kievan Rus and formed them into an elite personal guard, later known as the Varangian Guard. Composed largely of Norse and, from the 11th century, Anglo-Saxon warriors, the unit was famed for its loyalty since its foreign members had no local political ties. It served as the Byzantine emperors' bodyguard for several centuries. politics / war ●●

c. 988 The conversion of the Rus legendary 0 cit. Prince Vladimir of Kiev accepted Orthodox Christianity from Constantinople and had his people baptized, an event traditionally dated to 988. Chronicles say his envoys, awed by the beauty of worship in the Hagia Sophia, reported they knew not whether they stood in heaven or on earth. The choice bound the Rus lands to Byzantine faith, art, and letters, a legacy that shaped Russia for a thousand years. culture / diplomacy / religion ●●●

c. 25 December 1000 Foundation of the Kingdom of Hungary 0 cit. no story Stephen I is crowned as the first King of Hungary, founding a Christian kingdom that anchored the Hungarian state. politics / religion ●●●

c. 1000 The horse collar in Europe 0 cit. The padded collar, developed earlier in China, let horses pull heavy loads without choking. It made horses efficient for ploughing and hauling and boosted farm output. economy / technology ●●●

c. 1000 The rai stones of Yap 0 cit. Islanders on Yap used large carved limestone disks called rai as a store of value and for major transactions. Ownership could change without moving a stone, since the community tracked who held each one. culture / economy ●●●

c. 1000 Republic of Venice and its elected doge 0 cit. Venice was governed for centuries as a republic led by an elected doge and councils drawn from its merchant elite. Its stable oligarchic constitution made it a model of long-lived republican rule. economy / politics ●●●●

c. 1000 Leif Erikson reaches Vinland 0 cit. Norse sailors led by Leif Erikson reach Vinland in North America, five centuries before Columbus, as later confirmed by the settlement at L'Anse aux Meadows. The reach of the pagan Norse world spanned two continents. exploration / society ●●●

1000 Iceland converts to Christianity 0 cit. At the Althing assembly, Iceland peacefully adopts Christianity while quietly tolerating the old gods in private. The conversion of Scandinavia slowly ended open worship of the Norse gods, but the sagas preserved their stories. politics / religion ●●●

c. 1000 Roma ancestors leave northern India 0 cit. The Roma trace their origin to the Indian subcontinent, a conclusion drawn mainly from language. The Romani language shares its core vocabulary and grammar with Indic languages such as Sanskrit, Hindi, and Punjabi, and later genetic studies point to the same region. The date of the first migration out of India is not documented and is estimated by scholars, commonly placed around the year 1000. culture / society ●●●

c. 1000 Convivencia and its limits 0 cit. For long stretches Muslims, Jews, and Christians lived side by side in al-Andalus in what later scholars called convivencia, a coexistence that produced remarkable shared learning. It was not equality: Jews and Christians lived as dhimmis, protected but second-class subjects who paid a special tax and faced legal limits, and the peace broke into violence more than once, as in the 1066 Granada massacre. culture / religion / society ●●●

c. 1000 Rabbeinu Gershom, Light of the Exile, reforms Ashkenazi law 0 cit. Gershom ben Judah of Mainz led the first great yeshiva of Ashkenaz and issued rulings that shaped the community for centuries. Tradition credits him with the ban on polygamy for Ashkenazi Jews, a bar on divorcing a wife against her will, and a prohibition on reading others' mail. Later generations called him Me'or ha-Golah, the Light of the Exile. religion / society ●●

c. 1000 Yiddish emerges as the Ashkenazi language 0 cit. As Jews lived among German speakers, a new everyday language took shape. Yiddish fused medieval German with Hebrew and Aramaic vocabulary, written in the Hebrew alphabet, and later absorbed Slavic words as the community moved east. It became the mother tongue of Ashkenazi Jews and carried a vast literature, folklore, and press into the twentieth century. culture / society ●●●

c. 1000 The making of the Swahili language and civilization 0 cit. Out of centuries of contact between coastal Africans and Indian Ocean traders grew Swahili, a Bantu language enriched with Arabic and other loanwords, written for a time in Arabic script. Modern scholarship treats Swahili society as rooted primarily in African coastal communities that adopted Islam and ocean trade, not as a foreign transplant, correcting older accounts that stressed only Arab and Persian origins. The culture produced poetry, stone towns, and a distinct urban identity. culture / society ●●●

c. 1000 The Swahili coast, a cosmopolitan creole world 0 cit. Along the East African coast, Bantu-speaking Africans, Arab and Persian traders, and Indian Ocean merchants blended over centuries into the Swahili world, with its own language, towns, and Islamic culture. Identity there was made by commerce, faith, and marriage across the ocean, not by descent from a single tribe. The coast stands as a long example of belonging as something layered and open rather than sealed. Its early centuries are dated from archaeology and are approximate. economy / religion / society ●

c. 1000 Southern Nilotes settle the western highlands 0 cit. The Kalenjin peoples are Southern Nilotes, the branch that has lived longest in the Kenyan highlands, with roots in the region reaching back well over a thousand years. Early Southern Nilotic herders spread across the Rift Valley escarpments, Mount Elgon slopes, and Mau highlands. From this deep base grew the later Nandi, Kipsigis, Tugen, Marakwet, Keiyo, and Sabaot. society ●●●

c. 1000 The Shirazi tradition of Persian founders legendary 0 cit. Many coastal towns told of princes from Shiraz in Persia who sailed over in seven ships and founded the ruling dynasties, a story kept in the Kilwa Chronicle and in local lineage claims. Historians read it as a charter for status and Muslim respectability rather than a record of real migration. The Swahili elite used a Persian pedigree to mark rank, not to describe their actual ancestry. culture / society ●●

c. January 1005 Chanyuan Treaty 0 cit. Peace between Song China and the Khitan Liao dynasty under which the Song paid annual tribute in silk and silver. It bought more than a century of peace on the northern frontier. diplomacy / economy / politics / war ●●●

1009 Founding of the Ly Dynasty 0 cit. Ly Thai To founded the Ly dynasty and moved the capital to Thang Long, now Hanoi. The dynasty established a lasting Vietnamese state known as Dai Viet. politics ●●●

23 April 1014 Battle of Clontarf 0 cit. High King Brian Boru defeated an alliance of the Norse of Dublin and the king of Leinster at Clontarf, though Brian himself was killed. Nationalist tradition later cast it as the battle that broke Viking power in Ireland. Historians now read it more as a struggle for the high kingship among Irish rival dynasties, in which Norse forces fought on both sides. politics / war ●●

c. 1019 to c. 1054 Reign of Yaroslav the Wise 0 cit. Under Yaroslav the Wise, Kievan Rus reached a cultural and political high point, with the building of Saint Sophia Cathedral and the compiling of the law code known as the Russkaya Pravda. Dynastic marriages linked Kiev to royal houses across Europe. culture / politics / religion ●●●●

c. 1021 Ibn al-Haytham and the experimental study of light 0 cit. In his Book of Optics, Ibn al-Haytham (Alhazen) showed that we see because light reflects from objects into the eye, overturning older Greek theories. He insisted on testing ideas against controlled observation, and many historians credit him as an early champion of the experimental method. The claim that he invented the scientific method single-handed is an overstatement, but his stress on evidence over authority was real and influential. science ●●●

c. 1023 Jiaozi, the first paper money 0 cit. Private merchants in Sichuan issued paper notes called jiaozi, and the Song government took over their issue in the early eleventh century. This was the world's first government-backed paper currency. economy / technology ●●●●●

1024 First government paper money 0 cit. The Song state issued the world's first official paper currency, called jiaozi, in 1024. It grew from private merchant notes into a state-backed system. economy ●●●●●

c. 1025 Guido d'Arezzo invents staff notation 0 cit. The monk Guido d'Arezzo set out a system of lines and spaces to fix the pitch of each note. It let singers read music they had never heard and became the basis of Western notation. culture ●●●●

c. 1025 Ibn Sina's Canon of Medicine 0 cit. Ibn Sina (Avicenna) organized Greek and Islamic medicine into a single encyclopedic work that became a standard text in Europe and the Islamic world for centuries. It combined real clinical insight with the inherited humoral theory that was later abandoned. Its long reign shows both the strength and the danger of a single authoritative textbook. science ●●

1025 Basil II brings the empire to its medieval peak 0 cit. Basil II, called the Bulgar-Slayer after his long and brutal wars, died having pushed the frontiers to their greatest extent since Justinian. The empire he left was rich, disciplined, and dominant across the Balkans and the east. Within fifty years weak rule and court rivalries would squander that strength. politics / war ●●

c. 1037 Founding of the Seljuk Empire 0 cit. The Seljuk Turks under Tughril established a large empire across Persia and the Near East. They became protectors of the Abbasid caliph and pushed into Anatolia. politics / war ●●●●

c. 1040 Movable type printing 0 cit. Bi Sheng created reusable characters of fired clay to print pages. It was the first movable type, centuries before the same idea reshaped Europe. technology ●●●

c. 1040 Bi Sheng invents movable type 0 cit. The artisan Bi Sheng created movable type from baked clay around the 1040s. It was an early form of the technology that would later reshape publishing worldwide. technology ●●●●

c. 1040 Samuel ibn Naghrillah, vizier and general of Granada 0 cit. Samuel ibn Naghrillah, known as Samuel ha-Nagid, rose to become vizier of the Muslim kingdom of Granada and led its armies in the field, an almost unheard-of height for a Jew. He was also a major Hebrew poet and Talmudic scholar. His career shows how far a Jew could rise under Muslim rule, but it also stirred resentment that would soon turn deadly. culture / politics / war ●●●

1044 Rise of the Pagan Empire 0 cit. King Anawrahta unified the Irrawaddy valley and founded the Pagan Empire. It was the first Burmese state to unite the region and spread Theravada Buddhism. politics / religion ●●●

c. 1048 to c. 1308 Byzantine-Seljuk Wars 0 cit. no story Seljuk Turks defeat Byzantium at Manzikert in 1071 and settle Anatolia, which gradually turns Turkish and Muslim. The Byzantine appeal for help against them triggers the Crusades. war ●●●

c. 1050 Rise of Cahokia 0 cit. Cahokia grew into the largest city of the Mississippian culture near the Mississippi River. Its great earthen mounds made it the largest pre-Columbian site north of Mexico. politics / society ●●●●

c. 1050 Passage through Persia and the Middle East 0 cit. As they moved west, the Roma spent generations in Persia and neighboring lands. Romani absorbed a layer of Persian, Armenian, and Kurdish loanwords, which linguists use to reconstruct the route and rough timing of the migration. This stage left no written records of the people themselves, so the evidence is almost entirely linguistic. culture / society ●●

c. 1050 Solomon ibn Gabirol, poet and philosopher 0 cit. Solomon ibn Gabirol wrote both intense Hebrew religious poetry and a Neoplatonic philosophical work, the Fountain of Life. Translated into Latin, the book circulated in Christian Europe under the name Avicebron, and for centuries readers did not know its author was a Jew. He embodied the Sephardic blend of poetry, philosophy, and science. culture / religion / science ●●

1054 Battle of Mortemer wikidata 0 cit. no story 1054 battle ●●

16 July 1054 The Great Schism 0 cit. Papal legates excommunicate the Patriarch of Constantinople, who responds in kind. The break splits Christianity into the Catholic West and Orthodox East, a division that has never healed. religion ●●●●

16 July 1054 Great Schism of 1054 0 cit. Papal legates excommunicate Patriarch Michael Cerularius in Hagia Sophia, and he responds in kind. The mutual excommunications come to mark the lasting break between Roman Catholic and Eastern Orthodox Christianity. religion ●●●●

16 July 1054 The East-West Schism of 1054 0 cit. Papal legates and the Patriarch of Constantinople exchanged excommunications over disputes about papal authority and doctrine. The break split Christianity into the Roman Catholic and Eastern Orthodox churches, a division that has never healed. politics / religion ●●●●