About Siemowit II of Masovia
Siemowit II of Rawa, 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.
- Born
- 1283
- Died
- February 19, 1345
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