Timeline of official adoptions of Christianity

This is a timeline showing the dates when countries or polities made Christianity the official state religion, generally accompanying the baptism of the governing monarch.

Adoptions of Christianity to AD 1450

• c. 34 or 200 – Osroene – disputed; both dates claimed
• 179 – Silures; traditional date, now considered questionable^[1]
• 301 – Christianization of Armenia
• 301 – Foundation of San Marino
• c. 313 – Udis^[2]
• c. 319 – Christianization of Iberia (Georgia)^[3][4][5]
• c. 325 – Kingdom of Aksum (Ethiopian Orthodox Church)
• 337 – Roman Empire (baptism of Constantine I)
• 361 – Rome returns to paganism under Julian the Apostate
• 364 – Rome returns to Christianity, specifically the Arian Church
• c. 364 – Vandals (Arian Church)
• 376 – Goths and Gepids (Arian Church)
• 380 – Rome goes from Arian to Catholic/Orthodox (both terms are used refer to the same Church until 1054)
• 402 – Maronites (Nicene Church)
• 411 – Kingdom of Burgundy (Nicene Church)
• c. 420 – Najran (Nicene Church)
• 448 – Suebi (Nicene Church)^[6]
• c. 450 – Burgundy goes from Nicene to Arian^[7]
• 451 – Aksum and Najran are Coptic with Chalcedonian Schism.
• 466 – Suebi go from Chalcedonian to Arian
• 473 – Ghassanids (Chalcedonian Church)
• 480 – Lazica (Chalcedonian Church)
• 496 – Franks (Chalcedonian Church)
• 506 – Iberia goes from Chalcedonian to Apostolic
• c. 510 – Ghassanids go from Chalcedonian to Coptic
• 516 – Burgundy returns from Arian to Chalcedonian^[7]
• c. 543 – Makuria (Chalcedonian), Nobatia and Alodia (Coptic Church)
• c. 550 – Suebi return from Arian to Chalcedonian
• c. 558 – Christianization of Ireland (Celtic Church)
• c. 563 – Picts (Celtic Church)^[8]
• c. 568 – Lombards (Arian Church)
• 569 – Garamantes (Chalcedonian Church)
• 589 – Visigoths go from Arian to Chalcedonian
• 591 – Lombards go from Arian to Chalcedonian
• c. 592 – Lakhmids (Nestorian Church)
• 601 – Kent (Chalcedonian Church)
• 604 – East Anglia and Essex (Chalcedonian)
• 607 – Iberia returns from Apostolic to Chalcedonian
• 610 – Armenia and Udis go from Chalcedonian to Monophysite^[9][2]
• 616 – Kent and Essex return to paganism
• c. 620 – Alemanni (Chalcedonian Church)
• 624 – Kent returns from pagan to Chalcedonian
• 627 – Lombards return from Chalcedonian to Arian
• 627 – Northumbria – (Chalcedonian Church); East Anglia returns from Chalcedonian to pagan
• 630 – East Anglia returns from pagan to Chalcedonian
• 635 – Wessex (Chalcedonian Church)
• 653 – Lombards return from Arian to Chalcedonian
• 653 – Essex returns from pagan to Chalcedonian
• 655 – Mercia (Chalcedonian Church)
• 675 – Sussex (Chalcedonian Church)
• 685 – Maronites go from Chalcedonian to Monothelite
• 692 – Ireland goes from Celtic to Chalcedonian
• 696 – Bavaria (Chalcedonian)
• 706 – Udis are ecclesiastically subordinated to Armenia^[2]
• 710 – Picts go from Celtic to Chalcedonian
• c. 710 – Makuria goes from Chalcedonian to Coptic
• 724 – Thuringia
• 734 – Frisians
• 785 – Saxons
• c. 805 – Duchy of Lower Pannonia^[10]
• 840s – Navarre^[11]: 146
• 863 – Moravia
• 864 – Christianization of Bulgaria
• c. 869 – Christianization of the Serbs
• 879 – Duchy of Croatia^[10]
• 884 – Bohemia
• c. 900 – Alania^[12]
• 911 – Normans
• 960 – Denmark
• 966 – Christianization of Poland
• c. 989 – Christianization of Kievan Rus'
• 995 – Norway
• 999 – Faroe Islands
• c. 1000 – Christianization of Hungary with the first real Christian king (Roman Catholic became official but Eastern Orthodox existed as well since 973 onwards even after 1054)
• c. 1000 – Christianisation of Iceland
• 1007 – Kerait Khanate – Nestorian Church^[13]
• c. 1008 – Sweden
• 1054 – Byzantine Empire, Kingdom of Georgia, Alania, Bulgaria, Serbs, and Rus' are Eastern Orthodox with East-West Schism while Western Europe becomes Roman Catholic
• 1096 – Maronites return from Monothelite to Catholic^[14][15]
• c. 1100 – Circassia (most of the country would remain pagan in spite of Georgian expansion into the region)
• 1124 – Conversion of Pomerania
• 1160s – Obotrites
• c. 1200 – Finland
• 1227 – Livonia, Cumania
• 1241 – Saaremaa
• 1260 – Curonians
• 1290 – Semigallians
• 1387 – Christianization of Lithuania^[16]
• 1413 – Samogitia^[16]

Adoptions after 1450

• 1491 – Kingdom of Kongo (Roman Catholic Church)
• 1519 – Tlaxcala (Roman Catholic Church)
• 1521 – Rajahnate of Cebu (Roman Catholic Church)
• 1523 – Sweden goes from Catholic to Lutheran
• 1528 – Schleswig-Holstein goes from Catholic to Lutheran
• 1534 – England goes from Catholic to Anglican
• 1536 – Denmark-Norway and Iceland go from Catholic to Lutheran
• 1549 – Kingdom of Siau (Roman Catholic Church)
• 1553 – England returns from Anglican to Catholic
• 1558 – Kabardia (E. Orthodox Church)^[a]
• 1558 – England returns from Catholic to Anglican
• 1560 – Scotland goes from Catholic to Presbyterian
• 1610 – Mi'kmaq (Roman Catholic Church)
• 1624 – Kingdom of Ndongo (Roman Catholic Church)
• 1624 – Ethiopia goes from Coptic to Catholic
• 1631 – Kingdom of Matamba (Roman Catholic Church)
• 1633 – Ethiopia returns from Catholic to Coptic
• 1640 – Piscataway (Roman Catholic Church)
• 1642 – Huron-Wendat Nation (Roman Catholic Church)
• 1650 – Kingdom of Larantuka (Roman Catholic Church)
• 1654 – Onondaga (Roman Catholic Church)
• 1663–1665 – Kingdom of Loango (briefly Roman Catholic)
• 1675 – Illinois Confederation (Roman Catholic Church)
• 1680 – Siau goes from Catholic to Reformed^[17]
• 1700s – Kingdom of Bolaang Mongondow (Reformed Church)
• 1819 – Kingdom of Tahiti, Kingdom of Hawaii (Congregational Church)
• 1829 – Spokane, Kutenai (Anglican Church)
• 1830 – Samoa (Congregational Church)
• 1831 – Tonga (Methodist Church)
• 1838 – Nez Perce (Presbyterian Church)
• 1869 – Merina Kingdom (Reformed Church)
• 1882 – Blackfoot Confederacy (Roman Catholic Church)
• 1880 – Shoshone (LDS Church)
• 1884 – Lakota (Roman Catholic Church)
• 1884 – Catawba (LDS Church)
• 1897 – Shoshone go from LDS to Anglican
• 1907 – Arapaho (Baptist Church)

See also

• History of Christianity
• Christianization

Annotations

1. Circassian paganism remained the religion of the majority of the population until the 17th century.