Duchies of Poland

State · 1279–1304 CE · at its largest around 1294 CE

Fragmented Polish lands ruled by rival Piast dukes after the division of the realm, which were gradually reunited into a restored kingdom in 1320.

On its lands while it lasted

Königsberg (1255–1945 CE): Capital of Duchy of Prussia (1526–1618), Brandenburg-Prussia (1619–1701).