Siemowit IV
Duke of Masovia · Historical Figures · Lived 1352 to 1426 · aged 74
Siemowit IV, also known as Siemowit IV the Younger, was a Polish prince, member of the Masovian branch of the House of Piast and from 1373 or 1374 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, after 1386 hereditary Polish vassal, after 1388 ruler over Belz.
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A typical day, 30 days to 18 August 2026
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During 1382-1401 he lost Wizna and during 1384-1399 and 1407-1411 he lost Zawkrze, during 1384-1399 he lost Płońsk, which was taken by the Teutonic Order.
