The Duchy of Courland and Semigallia was a duchy in the Baltic region, then known as Livonia, that existed from 1561 to 1569 as a nominal vassal state of the Grand Duchy of Lithuania and subsequently
Double-Denar with monogram of Grand Duke Stephen Báthory and the coat of arms of Lithuania, minted in Mitau, 1578
Coin of the Duchy of Courland and Semigallia with portrait of Ernst Johann von Biron, coat of arms of Poland and the coat of arms of Lithuania, 1764
Jelgava Palace, the main residence of the dukes
Gotthard Kettler
Treaty of Vilnius (1561)
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The Treaty of Vilnius was concluded on 28 November 1561, during the Livonian War, between the Livonian Confederation and the Grand Duchy of Lithuania in Vilnius. With the treaty, the non-Danish and no
German translation of the Pacta subiectionis.
