Inowrocław

Inowrocław was a Piast duchy in Kuyavia around Inowrocław and Bydgoszcz. In 1337 the Teutonic Knights returned it to the Polish king Casimir III after occupying it during the Polish-Teutonic War.

Casimir incorporated the duchy into the Polish Crown in 1364 and established the Inowrocław Voivodeship on its territory. It later briefly revived as a fief under Piast princes, including Władysław of Opole in 1378, before its incorporation into Poland became final in 1392.