Duchy of Sieradz

The Duchy of Sieradz (Latin: ducatus Siradiae, Polish: Księstwo Sieradzkie) was one of the territories created during the period of the fragmentation of Poland. It was originally part of the central Seniorate Province, but became separated upon the death of High Duke Władysław III Spindleshanks in 1231, ruled by the rivaling Masovian branch of the Piast dynasty.

Duchy of Sieradz

Księstwo sieradzkie (pl)
Coat of arms
Poland 1275-1300, Sieradz marked in violet
StatusProvince of Poland
Fiefdom of the Polish Crown (from 1306)
Roman Catholic
Historical eraMiddle Ages
 Ruled by Bohemia
 Vassalized by the
   Polish Crown
 Incorporated by
Preceded by
Succeeded by
Seniorate Province
Sieradz Voivodeship (1339–1793)

In 1299 Duke Władysław I the Elbow-high had to cede Sieradz to King Wenceslaus II of Bohemia, who had also obtained the Seniorate Duchy of Kraków in 1291. Nevertheless, upon the extinction of the Bohemian Přemyslid dynasty in 1306, it was reunited with the Kingdom of Poland as a vassal duchy, and after 1339 incorporated by King Casimir III the Great into the Lands of the Polish Crown as Sieradz Voivodship. Around that time, the term Sieradz Land (terra Siradiensi, ziemia sieradzka) begun replacing the older Duchy nomenclature.

The importance of the territory is reflected in the Latin title of Polish kings: nec non terrarum Cracovie, Sandomirrie, Lancicie, Cuyavie, Syradziensis dux.

Dukes of Sieradz

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