Person:Siemowit IV, Duke of Masovia (1)

Siemowit IV , Duke of Masovia 1352
d.1425 or 1426
Facts and Events
Name Siemowit IV , Duke of Masovia
Gender Male
Birth[1] ca. 1352
Marriage ABT 1388 to Alexandra of Lithuania
Death[1] 1425 or 1426
Reference Number? Q1980579?

the text in this section is copied from an article in Wikipedia

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 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.

He was the second son of Siemowit III, Duke of Masovia and his first wife Euphemia, daughter of Nicholas II of Opava.

Already during his father's lifetime, Siemowit IV received his own district, Rawa Mazowiecka (ca. 1373/74), and as a result of the partition of Masovia between him and his older brother Janusz I after the death of their father on 16 June 1381, Siemowit IV finally obtain the totality of his domains: Rawa, Płock, Sochaczew, Gostynin, Płońsk and Wizna.

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  1. 1.0 1.1 Siemowit IV, Duke of Masovia, in Wikipedia: The Free Encyclopedia.