Example image of eyePlorer eyePlorer map for 'Bishopric of Courland': Livonian Crusade Low German Terra Mariana Theocracy Denmark Duchy of Courland and Semigallia Grand Duchy of Lithuania Livonian War Ancient history Balts Courland Curonians Gotland Pope Gregory IX Dominican Order Livonian Brothers of the Sword Teutonic Knights Battle of Durbe Grand Duchy of Moscow Duchy of Livonia Latvian language Livonia Union of Wilno Baltic Sea Daugava River Zemgale Polish–Lithuanian Commonwealth Gotthard Kettler District Grobiņa List of rulers of Prussia Livonian Order Kingdom of Livonia Magnus, Duke of Holstein Monarch Piltene Venta River Wilhelm Kettler Frederick II of Denmark Inheritance Friedrich Kettler 1232 Archbishopric of Riga February 11 Estonia Ruhnu Holy Roman Empire 1560 Appanage May 20