Riga Lettoniae

The Archbishopric of Riga was an ecclesiastical principality in central Livonia. Archbishop Frederick von Pernstein recovered lands from the rival Livonian Order through a papal ruling in 1335.

The archbishops helped organize the Livonian Confederation, whose diet first met in 1419. During the Livonian War, the territory was secularized in 1561 under the last archbishop, William of Brandenburg, and absorbed into the Duchy of Livonia. A new bishopric of Livonia was established in Latgalia in 1621 under the Polish–Lithuanian Commonwealth.