Category:Siemowit I, Duke of Masovia

**Siemowit I of Masovia**
	Polish duke
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Date of birth	1215 (statement with Gregorian date earlier than 1584), 1224
Date of death	23 June 1262
Family	Piast dynasty;
Father	Konrad I of Masovia;
Mother	Agafia of Rus;
Sibling	Judith of Masovia; Bolesław I of Masovia; Casimir I of Kuyavia;
Child	Bolesław II of Masovia; Konrad II of Masovia; Q125822393;
Spouse	Pereiaslawa of Galicia (1248–);
Authority file
	Q2701734;
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