Siemowit IV
Siemowit IV, also known as Siemowit IV the Younger, was a Polish prince member of the House of Piast from the Masovian branch, from 1373/74 Duke of Rawa, and after the division of the paternal inheritance between him and his brother in 1381, ruler over Rawa, Płock, Sochaczew, Gostynin, Płońsk and Wizna, since 1386 hereditary Polish vassal, since 1388 ruler over Belz, during 1382–1401 he lost Wizna and during 1384–1399 and 1407–1411 he lost Zawkrze, during 1384–1399 he lost Płońsk, taken by the Teutonic Order.
From *.wikipedia.org,
General Info
.
Male
Date of Birth
January 1st, 1352
Age
673
Date of Death
January 21st, 1426
Died Aged
74
Star Sign
Capricorn
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Relatives
Alexandra of Lithuania
Wife
Cymburgis of Masovia
Daughter
Euphemia of Masovia
Daughter
Maria of Masovia
Daughter
Siemowit III, Duke of Masovia
Father
Władysław I of Masovia
Son
Siemowit V of Masovia
Son
Casimir II of Masovia
Son
Janusz I of Warsaw
Brother
Euphemia of Masovia
Sister
Aleksander Mazowiecki
Son
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