Władysław I of Masovia
Polish noble · Lived 1389 to 1455 · aged 66
Władysław I of Płock, was a Polish prince and member of the House of Piast from the Masovian branch. He was a Duke of Płock, Rawa, Gostynin, Sochaczew, Belz, Płońsk, Zawkrze and Wizna during 1426-1434 jointly with his brothers.
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After the division of the paternal inheritance between him and his brothers in 1434, he became sole ruler over Płock, Płońsk, Wizna and Zawkrze. In 1442 he reunited their patrimony.