The śćDuchy 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. 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. 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)