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From 1138 to 1228, part of the Duchy of Kraków and Sandomierz, belonging to the high-dukes of Poland.

Dukes of Sieradz-ŁęczycaEdit

After 1305 parts of the united Kingdom of Poland initially as two vassal duchies, later incorporated as Łęczyca Voivodeship and Sieradz Voivodeship.

Dukes of SieradzEdit

After 1305 part of the united Kingdom of Poland as a vassal duchy, later after 1339 incorporated by the king Casimir III the Great as the Sieradz Voivodeship.

Dukes of ŁęczycaEdit

After 1305 part of the united Kingdom of Poland as a vassal duchy, later after 1343 incorporated by the king Casimir III the Great as the Łęczyca Voivodeship.