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How Christianity grew and split

From the Edict of Milan through the councils, the Great Schism, the Reformation, and the modern movements, Mormonism included.

Figures Clement V (pope)Constantine the GreatGregory I (pope)John XXIII (pope)Martin LutherPaul III (pope)

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    Edict of Milan

    also in Hinges of history, Religion and ideology

    Constantine and Licinius agree to tolerate Christianity throughout the Roman Empire, ending official persecution. Christianity moves from outlawed sect toward imperial religion, binding church and European power for over a millennium.

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    First Council of Nicaea

    also in Religion and ideology

    Constantine convenes the first ecumenical council; it produces the Nicene Creed and the first church-wide definition of orthodox Christian doctrine, condemning Arianism.

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    Council of Ephesus

    also in Religion and ideology

    The third ecumenical council condemns Nestorius and affirms Mary's title Theotokos, bearer of God. The dispute drives the Church of the East into a lasting separate existence.

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    Council of Chalcedon

    also in Religion and ideology

    The fourth ecumenical council defines Christ as one person in two natures, divine and human. Churches in Egypt, Syria, and Armenia reject the formula, creating the Oriental Orthodox split that endures today.

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    Gregory the Great becomes pope

    also in Religion and ideology

    Gregory I takes office and turns the papacy into a governing institution, administering Rome, negotiating with kings, and sending missionaries to England. His pontificate is widely seen as the moment the medieval papacy takes shape.

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    Great Schism of 1054

    also in Religion and ideology

    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.

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    Avignon papacy begins

    also in Religion and ideology

    Pope Clement V moves the papal court to Avignon under French influence, where seven successive popes reside. The long absence from Rome damages papal prestige and helps trigger the Western Schism.

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    Western Schism

    also in Religion and ideology

    Rival popes in Rome and Avignon, later joined by a third line, each claim legitimacy and divide Catholic Europe. The Council of Constance ends the schism and strengthens the conciliar movement.

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    Luther posts the Ninety-five Theses

    also in Religion and ideology

    Martin Luther publishes ninety-five theses against the sale of indulgences, traditionally by posting them on the castle church door. The protest ignites the Protestant Reformation and the permanent division of Western Christianity.

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    Zwingli begins the Reformation in Zurich

    also in Religion and ideology

    Huldrych Zwingli starts preaching straight through the Gospel of Matthew at the Grossmunster, breaking with the church lectionary. His scripture-first program launches the Swiss Reformed branch of Protestantism independently of Luther.

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    First Anabaptist baptisms

    also in Religion and ideology

    Conrad Grebel and companions rebaptize one another as believing adults, rejecting infant baptism. The act founds the Anabaptist movement, ancestor of the Mennonites, Amish, and Hutterites.

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    Council of Trent

    also in Religion and ideology

    The Catholic Church convenes a long council to answer the Reformation, defining doctrine on scripture, justification, and the sacraments and reforming clerical abuses. Trent shapes Catholicism for the next four centuries.

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    Pilgrims found Plymouth Colony

    also in Religion and ideology

    Separatist Pilgrims arriving on the Mayflower establish Plymouth Colony after signing the Mayflower Compact. Their settlement begins the transplanting of English dissenting Protestantism to North America.

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    George Fox founds the Quakers

    also in Religion and ideology

    George Fox gathers the first large followings of the Religious Society of Friends, preaching direct inward experience of God without clergy or sacraments. The Quaker movement grows despite heavy persecution.

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    John Wesley's Aldersgate experience

    also in Religion and ideology

    John Wesley feels his heart 'strangely warmed' at a meeting on Aldersgate Street, an experience he counts as his evangelical conversion. The moment launches the Methodist revival movement within and eventually beyond the Church of England.

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    Azusa Street Revival

    also in Religion and ideology

    A revival led by William J. Seymour breaks out and soon moves to a mission at 312 Azusa Street, marked by speaking in tongues and interracial worship. The meetings launch Pentecostalism, now one of Christianity's largest movements.

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    Second Vatican Council

    also in Religion and ideology

    Pope John XXIII opens a council that modernizes Catholic practice, allowing Mass in local languages and opening dialogue with other faiths. Vatican II is the most sweeping reform of Catholicism since Trent.

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