Bolesław III of Masovia — latest news, discussion & facts — IJR
Bolesław III of Masovia
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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