Category:Siemowit III, Duke of Masovia

**Siemowit III, Duke of Masovia**
	Polish nobleman
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Date of birth	1314 (statement with Gregorian date earlier than 1584)
Date of death	16 June 1381 (statement with Gregorian date earlier than 1584); Duchy of Masovia
Place of burial	Płock Cathedral;
Country of citizenship	Poland;
Noble title	Duke of Masovia;
Family	Piast dynasty;
Father	Trojden I, Duke of Masovia;
Mother	Maria of Galicia;
Sibling	Eufemia of Masovia; Bolesław Jerzy of Mazovia; Casimir of Masovia;
Child	Margaret of Masovia; Janusz I of Warsaw; Siemowit IV; Henry of Masovia; Euphemia of Masovia; Stanisław Siemowit of Masovia; Euphemia, Herzogin von Masovia;
Spouse	Euphemia of Opava (1335–);
Authority file
	Q2132097;
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