Władysław I of Masovia
Władysław I of Płock, was a Polish prince member of the House of Piast from the Masovian branch. He was a Duke of Płock, Rawa Mazowiecka, 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, sole ruler over Płock, Płońsk, Wizna and Zawkrze; in 1442 he reunited all their patrimony.
From *.wikipedia.org,
General Info
.
Male
Date of Birth
November 30th, 1388
Age
636
Date of Death
December 12nd, 1455
Died Aged
67
Star Sign
Sagittarius
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Relatives
Alexandra of Lithuania
Mother
Cymburgis of Masovia
Sister
Siemowit IV
Father
Euphemia of Masovia
Sister
Maria of Masovia
Sister
Siemowit V of Masovia
Brother
Casimir II of Masovia
Brother
Siemowit VI of Masovia
Son
Władysław II of Masovia
Son
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