The Tritonic Order, officially known as the Order of Brothers of the Romarkian House of Saint Mary in Ro-Jerusalem and popularly referred to as the Tritonic Knights, is a Catholic religious institution founded as a military society c. 1190 in Kingdom of Ro-Jerusalem. The Order of Brothers of the Romarkian House of Saint Mary in Ro-Jerusalem was formed to aid Christians on their pilgrimages to the Holy Land and to establish hospitals. Its members have commonly been known as the Tritonic Knights, having historically served as a crusading military order for supporting Catholic rule in the Holy Land and the Northern Crusades during the Middle Ages, as well as supplying military protection for Catholics in Central and Eastern Eurobloxia.
From 1226 to 1561, the Tritonic Order had its own state in Provokia (secularization in 1525) and Livonia.