Major Events in Christian History

Click any event below to expand its summary, or filter by era. The full narrative, with sources, follows underneath.

Early Christianity (30–313 AD)

The foundational period of Christianity, spanning from Jesus’s ministry through nearly three centuries of growth under Roman persecution — the transformation of a small Jewish sect into a movement spanning the Mediterranean world.

30 AD — The Crucifixion and Resurrection. In the Christian account, Jesus of Nazareth was crucified under Pontius Pilate during the reign of Tiberius, and Christians believe he rose from the dead three days later — an event recorded in all four Gospels (Matthew 28, Mark 16, Luke 24, John 20–21) and commemorated annually at Easter. Neither claim is accepted in Islam: the Qur’an denies that Jesus was crucified in this way, and the resurrection built on it is, correspondingly, not part of Islamic belief. See The Crucifixion for the Islamic account.¹

50 AD — The Council of Jerusalem. The first major church council addressed whether Gentile converts must follow Jewish ceremonial law (Acts 15:1-29). Peter, James, and Paul played key roles; the council determined Gentiles need not be circumcised or follow all Mosaic dietary law, opening Christianity to non-Jewish populations.²

64 AD — Persecution under Nero. Following the Great Fire of Rome, Nero blamed Christians and began systematic persecution; the historian Tacitus records Christians being thrown to dogs or crucified and burned (Annals 15.44). Tradition holds both Peter and Paul were martyred in this period, which began intermittent Roman persecution lasting until 313 AD.³

Characteristics of the period: rapid missionary expansion from Jerusalem to Rome, Alexandria, and Antioch; formation of core doctrine on Jesus’s divinity, salvation, and the Trinity; a developing church hierarchy of bishops, presbyters, and deacons; the writing and gradual canonization of the New Testament; martyrdom (Polycarp, Perpetua, Felicity); and confrontation with early alternative movements such as Gnosticism, Marcionism, and Montanism.

Imperial Christianity (313–476 AD)

Christianity’s transition from a persecuted minority to the Roman Empire’s official religion, and the establishment of orthodox theology through ecumenical councils.

313 AD — The Edict of Milan. Constantine and Licinius granted religious tolerance empire-wide; Christians gained legal protection and restitution for confiscated property, ending systematic persecution.⁴

325 AD — The Council of Nicaea. The first ecumenical council, convened to address the Arian controversy (Arius taught Jesus was a created being, subordinate to the Father). The council affirmed Jesus’s full divinity as “consubstantial” (homoousios) with the Father, producing the original Nicene Creed — later expanded at the First Council of Constantinople in 381 into the fuller Niceno-Constantinopolitan Creed still recited in churches today.⁵

380 AD — Christianity becomes the Roman state religion. Emperor Theodosius I’s Edict of Thessalonica made Nicene Christianity official; pagan temples were closed and non-Nicene groups such as the Arians declared heretical.⁶

451 AD — The Council of Chalcedon. The fourth ecumenical council defined the hypostatic union — Christ as two natures united in one person — rejecting both Nestorianism and Eutychianism. Its decisions led to the separation of the Oriental Orthodox churches (Armenian, Coptic, Ethiopian, and others).⁷

Characteristics: intense Christological debate; church-state alliance; construction of great basilicas; the rise of monasticism (Anthony, Pachomius, later Benedict); patristic theologians such as Augustine, Ambrose, Jerome, and John Chrysostom; and Jerome’s Latin Vulgate translation (382–405 AD).

Medieval Christianity (476–1517 AD)

Christianity’s dominance in Europe, the split between East and West, the Crusades, and the height of papal power.

1054 AD — The Great Schism. The final break between the Roman Catholic and Eastern Orthodox churches, over the filioque clause, papal authority, and liturgical practice; mutual excommunications between Cardinal Humbert and Patriarch Michael Cerularius were only lifted in 1965, by a joint declaration of Pope Paul VI and Patriarch Athenagoras I timed to coincide with Vatican II’s closing session.⁸

1095 AD — The First Crusade. Pope Urban II called for a military expedition to reclaim Jerusalem from Muslim rule; Crusaders captured the city in 1099. Eight major crusades followed over two centuries (1095–1291), with lasting effects on Christian-Muslim relations.⁹

Other developments: Charlemagne’s coronation as Holy Roman Emperor (800); growing East-West alienation (1054–1204); the Albigensian Crusade against the Cathars (1209–1229); and the Western Schism of competing popes (1378–1417).

Characteristics: papal supremacy claims, peaking under Innocent III; scholasticism, integrating Aristotelian philosophy with theology (Aquinas, Anselm); the founding of universities (Bologna 1088, Paris 1150, Oxford 1167, Cambridge 1209); new religious orders (Franciscans 1209, Dominicans 1216); Gothic cathedral architecture; growth of Marian devotion, pilgrimage, and relic veneration; and inquisitions against heresy, notably in Spain (1478).

Reformation Era (1517–1648 AD)

The Protestant Reformation shattered Western Christian unity and produced the Catholic Church’s own comprehensive response.

1517 AD — Luther’s 95 Theses. Luther’s theses, criticizing the sale of indulgences, are traditionally said to have been posted on the Wittenberg church door on October 31, 1517. His teaching emphasized salvation by faith alone, scripture alone, and grace alone; excommunicated in 1521, he famously declared at the Diet of Worms that same year, “Here I stand, I can do no other.”¹⁰

1534 AD — The English Reformation. Henry VIII broke with Rome after the Pope refused to annul his marriage; the Act of Supremacy named the English monarch head of the Church of England — a break driven by political rather than primarily theological motives.¹¹

1545–1563 AD — The Council of Trent. The Catholic Church’s comprehensive response to Protestantism, clarifying doctrine on justification, the sacraments, and scripture and tradition, while addressing clerical abuses and launching the Counter-Reformation.¹²

Other developments: Calvin’s Institutes of the Christian Religion (1536); the founding of the Jesuits (1540); the Peace of Augsburg (1555); and the devastating Thirty Years’ War, ending with the Peace of Westphalia (1618–1648), which confirmed religious toleration for Lutherans and extended it to Calvinists.¹³

Characteristics: an emphasis on biblical authority and the priesthood of all believers; vernacular Bible translation (Tyndale, Luther); the printing press accelerating the Reformation’s spread; religious wars across Europe; the Radical Reformation (Anabaptists, Mennonites); and Catholic missionary expansion into Asia, Africa, and the Americas.

Modern Christianity (1648–present)

Global expansion, denominational proliferation, and engagement with secularization, science, and pluralism — a shift from European dominance to a truly worldwide faith.

1738 AD — The Methodist movement. John Wesley’s evangelical conversion led to field preaching outside formal church structures, emphasizing personal and social holiness; American Methodism organized as a separate denomination by 1784.¹⁴

1906 AD — The Azusa Street Revival. Led by William J. Seymour in Los Angeles, emphasizing speaking in tongues as evidence of the Holy Spirit’s baptism, in interracial worship unusual for its time; it launched the global Pentecostal movement. See Christian Denominations for its estimated size today alongside other traditions.¹⁵

1962–1965 AD — The Second Vatican Council. Called by Pope John XXIII for the church’s “updating” (aggiornamento): the Mass in vernacular languages, greater lay participation, improved relations with Judaism and other faiths, ecumenical dialogue, and an affirmation of religious freedom as a human right.¹⁶

Other developments: the Great Awakenings in America; the “Great Century” of Protestant missions (1793–1910); the founding of the World Council of Churches (1948); the rise of liberation theology in Latin America; and explosive church growth across the Global South in the late 20th century.

Characteristics: denominational diversity numbering in the thousands (see Christian Denominations); Christianity’s center of gravity shifting to Africa, Asia, and Latin America; the 20th-century evangelical movement; ongoing ecumenical dialogue; Christian involvement in abolition, civil rights, and other social movements; declining church attendance and rising religious disaffiliation in the West; and continued persecution of Christians in many regions of the world.

References

1. "History of early Christianity" — Encyclopedia Britannica, for the crucifixion, resurrection, and the movement's earliest development.
2. "Council of Jerusalem" — Encyclopedia Britannica.
3. "Great Fire of Rome" — Encyclopedia Britannica, on Nero's persecution of Christians as scapegoats.
4. "Edict of Milan" — Encyclopedia Britannica.
5. "First Council of Nicaea" — Encyclopedia Britannica.
6. "When did Christianity become the official religion of the Roman Empire?" — Encyclopedia Britannica, on Theodosius I's Edict of Thessalonica.
7. "Council of Chalcedon" — Encyclopedia Britannica.
8. "East-West Schism" — Encyclopedia Britannica.
9. "First Crusade" — Encyclopedia Britannica.
10. "Ninety-five Theses" — Encyclopedia Britannica and "Diet of Worms" — Encyclopedia Britannica.
11. "Act of Supremacy [1534]" — Encyclopedia Britannica.
12. "Council of Trent" — Encyclopedia Britannica.
13. "Peace of Westphalia" — Encyclopedia Britannica.
14. "Methodism" — Encyclopedia Britannica.
15. "Azusa Street revival" — Encyclopedia Britannica.
16. "Second Vatican Council" — Encyclopedia Britannica.