Duchy of Brześć Kujawski

The Duchy of Brześć Kujawski,^[a] also known as the Duchy of Kuyavian Brest, was a district principality in the Central Europe, in the region of Kuyavia. Its capital was Brześć Kujawski. It was formed on 3 January 1268 in the partition of the Duchy of Kuyavia. Its first ruler was duke Władysław I Łokietek of the Piast dynasty.^[1][2] The state was conquered by the State of the Teutonic Order in 1332, during Polish–Teutonic War, with its capitol being captured on 21 April.^[3][4] Until 1300, it was an independent state, after what, it had become a fiefdom within the Kingdom of Poland, that in 1320, got transformed into the United Kingdom of Poland.

Duchy of Brześć Kujawski Księstwo brzesko-kujawskie (Polish) Ducatus Brestensis (Latin)
1268–1332
Coat of arms
Duchy of Brześć Kujawski within the Kingdom of Poland in 1300.
Status	Independent state (1268–1300) Fiefdom within the Kingdom of Poland (1300–1320) Fielfdom within the United Kingdom of Poland.
Capital	Brześć Kujawski
Official languages	Polish, Latin
Religion	Roman Catholic
Government	District principality
Duke
• 1267–1288 (first)	Władysław I Łokietek Casimir II of Łęczyca Siemowit of Dobrzyń
• 1306–1332 (last)	Władysław I Łokietek
Historical era	High Middle Ages
• Partition from the Duchy of Masovia	3 January 1268
• Incorporation into the State of the Teutonic Order	21 April 1332
Preceded by Succeeded by Duchy of Kuyavia State of the Teutonic Order
Today part of	Poland

List of rulers

• Władysław I Łokietek, Casimir II of Łęczyca and Siemowit of Dobrzyń (1267–1288)
• Władysław I Łokietek (1288–1300)
• Wenceslaus II of Bohemia (1300–1305)
• Wenceslaus III of Bohemia (1305–1306)
• Władysław I Łokietek (1306–1332)