About Władysław I of Masovia
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. 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.
- Born
- 1389
- Died
- December 12, 1455
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