Siemowit II of Rawa (pl: Siemowit II rawski; 1283 – 18 February 1345), was a Polish prince member of the House of Piast, Duke of Warsaw and Liw during 1310-1313, after a new division with his brothers since 1313 ruler over Rawa Mazowiecka, Sochaczew, Zakroczym, Gostynin, Ciechanów and Wizna, regent of Płock during 1336–1340.
Find a Grave, database and images (https://www.findagrave.com: accessed ), memorial page for Siemowit of Masovia II (unknown–18 Feb 1345), Find a Grave Memorial no. 158611788, citing Plock Cathedral, Płock, Miasto Płock, Mazowieckie, Poland ; Maintained by Todd Whitesides (contributor 47553735) .
He was the second son of Siemowit III, Duke of Masovia and his first wife Euphemia, daughter of Nicholas II of Opava.
Siemowit II of Masovia or Ziemowit (1283-18 February 1345 ) was Duke of Masovia from 1310-1345. He was a member of the House of Piast. Siemowit was Duke of Warsaw and Liw (1310-1313). In 1313, he became the ruler of Duchy of Rawa. He was regent of Płock (1336-1340).
Siemowit was elected as new duke by the wiec. According to a popular legend, Popiel was then eaten by mice in his tower on the Gopło lake.  The only mention of Siemowit, along with his son Lestko and grandson Siemomysł, comes in the mediæval chronicle of Gallus Anonymus.  References. 1. ^ K. Jasiński, Rodowód pierwszych Piastów, p. 47.
- Algimina, Wrocław-Wrocisław król kró..., Lestek, Duke of the Polans, Sakosława, Wyszosława
Sep 18, 2020 · After 1420 Siemowit IV, due to his progressive blindness, gradually gave participation in the government to his adult sons. In 1425, the dispute about the election of his Chancellor Stanisław z Pawłowic as Bishop of Płock didn't brought anything good to Masovia, and only forced his sons Siemowit V and Casimir II into a humiliating surrender.
Siemowit I of Masovia (Polish: Siemowit (Ziemowit) I mazowiecki) (d. 23 June 1262), was a Polish prince member of the House of Piast, Duke of Czersk during 1247-1248, Duke of Masovia (except Dobrzyń) during 1248-1262, ruler over Sieradz during 1259-1260. He was the sixth son of Konrad I of Masovia and his wife Agafia of Rus.
Siemowit V of Rawa (pl: Siemowit V rawski; 1389 - 17 February 1442), was a Polish prince member of the House of Piast from the Masovian branch.He was a Duke of Rawa Mazowiecka, Płock, Sochaczew, Gostynin, Płońsk, Wizna and Belz during 1426-1434 jointly with his brothers, and after the division of the paternal inheritance between him and his brothers in 1434, sole ruler over Rawa Mazowiecka ...
Siemowit IV Piast of Mazovia was born circa 1353 to Siemowit III of Masovia (bef1314-1381) and Euphemia of Troppau (c1320-1352) and died circa 21 January 1426 of unspecified causes. He married Alexandra of Lithuania (c1368-1434) circa 1387. Notable ancestors include Charlemagne (747-814), Alfred the Great (849-899), Hugh Capet (c940-996). Ancestors are from Russia, Ukraine, France, Germany ...
Siemowit was the second son of Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia. In 1341, following the death of their father and brother, Siemowit and his younger brother Casimir inherited the Duchy of Czersk. In 1345 following the death of their uncle Siemowit II of Rawa, they also inherited the Duchy of Rawa.