Category:Boleslaus III, Duke of Płock

**Bolesław III of Masovia**
	Polish prince member of the House of Piast, Duke of Płock since 1336 (under regency until 1340), ruler over Wizna and Sochaczew since 1345, formally a vassal of the Kingdom of Bohemia during all his reign
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Date of birth	1320s (before 1330, after 1322)
Date of death	20 August 1351; Mělník
Manner of death	homicide;
Place of burial	Płock Cathedral;
Occupation	feudatory; ruler;
Noble title	Duke of Masovia;
Family	Piast dynasty;
Father	Wenceslaus of Płock;
Mother	Elizabeth Giedyminowicz;
Sibling	Anna of Plock;
Authority file
	Q2628158;
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