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 or 200 – Osroene – disputed; both dates claimed 179 – Silures; traditional date, now considered questionableSilures at HistoryFiles 301 – Christianization of Armenia; traditional date, but estimates have been given from a range of 284 to 325 301 – Foundation of San Marino – UdisThe Caucasus & Globalization, Vol 2, 2008, p. 101 – Christianization of Iberia (Georgia)Toumanoff, Cyril, "Iberia between Chosroid and Bagratid Rule", in Studies in Christian Caucasian History, Georgetown, 1963, pp. 374-377. Accessible online at Rapp, Stephen H., Jr (2007). "7 - Georgian Christianity". The Blackwell Companion to Eastern Christianity. John Wiley & Sons. p. 138. . Retrieved 11 May 2012. – 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 – 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) – Najran (Nicene Church) 448 – Suebi (Nicene Church)Hubert Jedin, 1980, The Imperial Church from Constantine to the Early Middle Ages p. 226. – Burgundy goes from Nicene to ArianJodocus Birkhaeuser, 1898, History of the Church, from Its First Establishment p. 148. 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 – Ghassanids go from Chalcedonian to Coptic 516 – Burgundy returns from Arian to Chalcedonian – Makuria (Chalcedonian), Nobatia and Alodia (Coptic Church) – Suebi return from Arian to Chalcedonian – Christianization of Ireland (Celtic Church) – Picts (Celtic Church)"The Celtic Church in Scotland", The Celtic Magazine Vol 11, 1886 p. 102. – Lombards (Arian Church) 569 – Garamantes (Chalcedonian Church) 589 – Visigoths go from Arian to Chalcedonian 591 – Lombards go from Arian to Chalcedonian – 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 616 – Kent and Essex return to paganism – 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 710 – Picts go from Celtic to Chalcedonian – Makuria goes from Chalcedonian to Coptic 724 – Thuringia 734 – Frisians 785 – Saxons – Duchy of Lower PannoniaAlexandru Magdearu, The Wars of the Balkan Peninsula: Their Medieval Origins, p. 117. 840s – Navarre 863 – Moravia 864 – Christianization of Bulgaria – Christianization of the Serbs 879 – Duchy of Croatia 884 – Bohemia c. 900 – Alania 911 – Normans 960 – Denmark 966 – Christianization of Poland – Christianization of Kievan Rus' 995 – Norway 999 – Faroe Islands – 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) – Christianisation of Iceland 1007 – Kerait Khanate – Nestorian Churchİsenbike Togan, 1999, Flexibility and Limitation in Steppe Formations: The Kerait Khanate p. 60. – 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 – Circassia (most of the country would remain pagan in spite of Georgian expansion into the region) 1124 – Conversion of Pomerania 1160s – Obotrites – Finland 1227 – Livonia, Cumania 1241 – Saaremaa 1260 – Curonians 1290 – Semigallians 1387 – Christianization of Lithuania 1413 – Samogitia

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) 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 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

References