# 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
* 301 – Christianization of Armenia
* 301 - Foundation of San Marino
* c. 313 – Caucasian Albania (Udi)
* c. 319 – Christianization of Iberia (Georgia)
* 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)
* c. 450 – Burgundy goes from Nicene to Arian
* 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
* 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)
* 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 Caucasian Albania go from Chalcedonian to Monophysite
* 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 – Caucasian Albania is ecclesiastically subordinated to Armenia
* 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
* 840s – Navarre$^{:146}$
* 863 – Moravia
* 864 – Christianization of Bulgaria
* c. 869 – Christianization of the Serbs
* 879 – Duchy of Croatia
* 884 – Bohemia
* c. 900 – Alania
* 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 Orthodox(Eastern) existed as well since 973 onwards even after 1054).
* c. 1000 – Christianisation of Iceland
* 1007 – Kerait Khanate – Nestorian Church
* c. 1008 – Sweden
* 1054 – Byzantine Empire, Kingdom of Georgia, Alania, Bulgaria, Serbs, and Rus' are Orthodox Catholics with East-West Schism while Western Europe becomes Roman Catholic
* 1096 – Maronites return from Monothelite to Catholic
* 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 – (Southwestern) Finland
* 1227 – Livonia (Estonia and Latvia), Cumania (Transylvania)
* 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)