The Prince-Bishopric of Warmia (, ) was a semi independent ecclesiastical state, ruled by the incumbent ordinary of the Ermland/Warmia see and comprising one third of the then diocesan area. The other two thirds of the diocese were under the secular rule of Monastic state of the Teutonic Knights (Teutonic Prussia) (till 1525, and Ducal Prussia thereafter). The Ermland/Warmia see was a Prussian diocese under the jurisdiction of the Archbishopric of Riga that was a protectorate of Teutonic Prussia (1243–1466) and a protectorate of Kingdom of Poland, later part of the Polish-Lithuanian Commonwealth after the Peace of Thorn (1466-1772)