The Duchy of Brześć Kujawski, 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.Jacek Osińsk, Bolesław Rodatka, p. 294-295.Marcin Hlebionek, Bolesław Pobożny, p. 95-96. 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.Witold Mikołajczak, Wojny polsko-krzyżackie, p. 56-58.Piotr W. Lech, Pierwsza wojna polsko-krzyżacka 1308-1343, p. 132-134. 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.
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)
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Bibliography Jacek Osińsk, Bolesław Rodatka Marcin Hlebionek, Bolesław Pobożny Witold Mikołajczak, Wojny polsko-krzyżackie Piotr W. Lech, Pierwsza wojna polsko-krzyżacka 1308-1343