Siemowit III, Duke of Masovia

Siemowit III
Duke of Masovia
Princely seal of Siemowit III; 1371
Bornc. 1320
Died(1381-06-16)16 June 1381
BuriedPłock Cathedral
Noble familyPiast
SpousesEuphemia of Opava
Anna of Ziębice
IssueEuphemia
Anna
Janusz I of Warsaw
Margaret
Siemowit IV of Masovia
Henry of Masovia
FatherTrojden I of Masovia
MotherMaria of Galicia

Siemowit III of Masovia (alternatively Ziemowit III; c. 1320 – 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia.

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