Siemowit IV of Masovia

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History and politics

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4

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What Wikipedia says

Siemowit IV (Ziemowit IV), also known as Siemowit IV the Younger (pl: Siemowit IV Młodszy; ca. 1353/1356 – 21 January 1426), 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.

Excerpt from the Wikipedia article “Siemowit IV of Masovia”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Grzegorz W. Tężycki, CC BY 4.0, via Wikimedia Commons.