Christianity Arrives in Roman Judea. Israel, 30, Arrived. Source, The Ecclesiastical History (Historia Ecclesiastica).
Christianity Established In Rome. Italy, 40 to 313, Established. Source, Tacitus, Annals, Book XV.
Pauline Missions Through Asia Minor and Greece. Turkey, 46 to 57, Established. Source, The New Testament, Acts of the Apostles.
Edessa And Osrhoene, An Early Christian Kingdom. Turkey, 200, Established. Source, The Ecclesiastical History (Historia Ecclesiastica).
The Church of the East in Sasanian Persia. Persia, 200 to 410, Established. Source, The Church of the East: An Illustrated History of Assyrian Christianity.
The Decian and Diocletianic Persecutions Suppress Christianity in the Roman Empire. Italy, 250 to 311, Suppressed. Source, The Ecclesiastical History (Historia Ecclesiastica).
Armenia, The First State To Adopt Christianity. Armenia, 301, Dominant. Source, The Church of Armenia: Her History, Doctrine, Rule, Discipline, Liturgy, Literature and Existing Condition.
The Edict of Milan. Italy, 313, Established. Source, Codex Theodosianus (The Theodosian Code).
Christianity Reaches Aksum. Ethiopia, 330, Dominant. Source, Ancient Churches of Ethiopia: Fourth-Fourteenth Centuries.
The Edict of Thessalonica. Greece, 380, Dominant. Source, Codex Theodosianus (The Theodosian Code).
Patrick's Mission to Ireland. Ireland, 431 to 493, Established. Source, Early Christian Ireland.
The Gregorian Mission To Kent. England, 597, Arrived. Source, Ecclesiastical History of the English People.
The Church of the East Reaches Tang China. China, 635 to 781, Arrived. Source, The Church of the East: An Illustrated History of Assyrian Christianity.
The Huichang Suppression Of Christianity In Tang China. China, 841 to 845, Suppressed. Source, The Church of the East: An Illustrated History of Assyrian Christianity.
The Cyrillo Methodian Mission to Great Moravia. Czech Republic, 863 to 885, Arrived. Source, Byzantine Missions Among the Slavs: SS. Constantine-Cyril and Methodius.
Christianity Reaches Scandinavia. Scandinavia, 965 to 1000, Established. Source, The Conversion of Scandinavia: Vikings, Merchants, and Missionaries in the Remaking of Northern Europe.
The Baptism of Vladimir and the Rus. Ukraine, 988, Dominant. Source, The Emergence of Rus, 750-1200.
Timur's Campaigns Nearly Extinguish the Church of the East. Mesopotamia, 1380 to 1405, Extinct. Source, The Church of the East: An Illustrated History of Assyrian Christianity.
Portugal's Missionaries Baptize The King Of Kongo. Angola, 1491 to 1495, Arrived. Source, Joao I Of Kongo (Wikipedia).
Iberia to the Americas. Mexico, 1492 to 1572, Arrived. Source, The Spanish Struggle for Justice in the Conquest of America.
This spoken summary covers the first 20 of 40 recorded events, in date order. The remaining 20 events and full source detail for every event are in the Full Chronology list below.