Bolesław III of Płock
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Bolesław III of Płock (pl: Bolesław III płocki; 1322/30 – 20 August 1351), was a 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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He was the only son of Wenceslaus of Płock and Dannila (Elisabeth), a daughter of Gediminas, Grand Duke of Lithuania.