Siemowit V of Masovia
Polish prince / From Wikipedia, the free encyclopedia
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Siemowit V of Rawa (pl: Siemowit V rawski; 1389 - 17 February 1442), was a Polish prince member of the House of Piast from the Masovian branch. He was a Duke of Rawa Mazowiecka, Płock, Sochaczew, Gostynin, Płońsk, Wizna and Belz during 1426-1434 jointly with his brothers, and after the division of the paternal inheritance between him and his brothers in 1434, sole ruler over Rawa Mazowiecka, Gostynin and Sochaczew.
He was the eldest son of Siemowit IV, Duke of Masovia and Alexandra of Lithuania, daughter of Algirdas.