Category
page 114th-century disestablishments in Poland
Duchy of Silesia
Medieval duchy in the historic region of Silesia (1138-1249/1335/1742)
Duchy of Greater Poland
historical Polish province
Duchy of Sandomierz
Polish fiefdom of 1138 to 1320
Duchy of Sieradz
Polish duchy (1231–1339)
Duchy of Łęczyca
Polish duchy (1231–1352)
Księstwo bydgosko-wyszogrodzkie
Former monarchy in Europe
Duchy of Płock
duchy in Mazovia
Duchy of Czersk
former monarchy in Europe
Duchy of Inowrocław
Polish duchy (1267–1364)