The Teutonic Order is a Catholic religious institution founded as a military society 1190 in Acre, Kingdom of Jerusalem. The Order of Brothers of the German House of Saint Mary in Jerusalem was formed to aid Christians on their s to the Holy Land and to establish hospitals. Its members have commonly been known as the Teutonic Knights, having historically served as a crusading military order for supporting Catholic rule in the Holy Land and the forced conversion to Catholicism in the Baltics during the Middle Ages, as well as providing military protection for Catholics in Eastern Europe.
Purely religious since 1810, the Teutonic Order still confers limited honorary knighthoods. The Bailiwick of Utrecht of the Teutonic Order, a Protestant chivalric order, is descended from the same medieval military order and also continues to award knighthoods and perform charitable work.
The name of the Order of Brothers of the German House of Saint Mary in Jerusalem is in Orden der Brüder vom Deutschen Haus der Heiligen Maria in Jerusalem and in Latin Ordo domus Sanctae Mariae Theutonicorum Hierosolymitanorum. Thus the term "Teutonic" echoes the German origins of the order (Theutonicorum) in its Latin name. German-speakers commonly refer to the Deutscher Orden (official short name, literally "German Order"), historically also as Deutscher Ritterorden ("German Order of Knights"), Deutschherrenorden ("Order of the German Lords"), Deutschritterorden ("Order of the German Knights"), Marienritter ("Knights of Mary"), Die Herren im weißen Mantel ("The lords in white capes"), etc..
The Teutonic Knights have been known as Zakon Krzyżacki in Polish ("Order of the Cross") and as Kryžiuočių Ordinas in Lithuanian, Vācu Ordenis in Latvian, Saksa Ordu or, simply, Ordu ("The Order") in Estonian, as well as various names in other languages.
A manuscript by Karl Marx once characterised the forces of the Order as Reitershunde – meaning something like a "pack of knights".