Duchy of Prussia

This article is about the specific polity Duchy of Prussia and therefore only includes events related to its territory and not to its possessions or colonies. If you are interested in the possession, this is the link to the article about the nation which includes all possessions as well as all the different incarnations of the nation.

If you are looking for the page with the statistics about this polity you can find it here:All Statistics

Was a duchy established in 1525 in eastern Prussia, after West Prussia had become the Polish province of Royal Prussia, according to the Peace of Toruń (Thorn) of 1466. It remained a vassal state of the Polish-Lithuanian Commonwealth until 1657 when the Hohenzollern prince-electors of the Margraviate of Brandenburg acquired suzerainty over the territory under the Treaty of Wehlau.

Establishment

April 1525: In 1525, during the Polish-Teutonic War, the Teutonic Knights, led by Grand Master Albert of Brandenburg, took advantage of Polish financial troubles and fatigue to launch a successful counteroffensive, capturing Nowe Miasto Lubawskie in the Duchy of Prussia.

April 1525: The Cavalry War from 1519 to 1521 was the last military attempt by the Teutonic Order under its last Grand Master, Albrecht von Brandenburg-Ansbach, to liberate the Teutonic Order state in East Prussia from Polish tutelage. In the armistice after unsuccessful fighting, Albrecht became a Protestant, secularized the country in 1525 and was the first Duke of Prussia to take it as a fief from King Sigismund I of Poland.