This is a list of rulers who converted to Christianity. The conversion of monarchs was often an important step in the process of Christianization.
1st century
Abgar V, King of Osroene with his capital at Edessa, c. 1st century
4th century
Tiridates III of Armenia, King of Armenia, in 301 Ezana of Axum, King of Aksum, 320 Constantine I, Roman emperor, in 337 Mirian III of Iberia, King of Iberia, c. 337
5th century Óengus mac Nad Froích, King of Munster Clovis I, King of the Franks, circa 496-506 Rechiar, King of the Suebi
6th century Constantine of Dumnonia Saint Constantine of Strathclyde Rædwald of East Anglia Reccared I, king of visigoths, and Hermenegild, sub-king in Baetica, converted from Arianism to the Nicene faith.
7th century Æthelberht of Kent before 601 (see Gregorian mission) Cenwalh of Wessex Cynegils of Wessex Sigeberht of East Anglia Riderch I of Alt Clut Peada of Mercia Edwin of Northumbria
9th century Mojmir I of Moravia (818 or 824) Boris I of Bulgaria (864) Guthrum (878) Borivoj I, Duke of Bohemia (883) Rorik of Dorestad Harald Klak
10th century Mieszko I of Poland (966) Géza, Grand Prince of the Hungarians (970s) Vladimir I of Kiev (980s) Olaf Tryggvason Harald Bluetooth of Denmark and Norway Eric the Victorious Haakon the Good
11th century Olof Skötkonung, King of Sweden (1008)
14th century Jogaila, Grand Duke of Lithuania and King of Poland (1386)
16th century Nzinga of Ndongo and Matamba Afonso I of Kongo Humabon, Rajah of Cebu (1521) Bunao Lakan Dula, Lakan of Tondo (c. 1571) Rajah Matanda of Maynila (1572) Ōtomo Sōrin (although not a direct royalty, Japanese daimyo were de facto independent rulers of their territories) Arima Harunobu Ōmura Sumitada
19th century Hone Heke Keopuolani Ka'ahumanu Kamehameha III Tamati Waka Nene Ranavalona II of Madagascar Pomare II Duleep Singh
References