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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 · Models · Lived c. 1320 to 1351
Bolesław III of Płock, was a Polish prince member of the House of Piast, Duke of Płock since 1336, ruler over Wizna and Sochaczew since 1345, formally a vassal of the Kingdom of Bohemia during all his reign.
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