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About Siemowit I of Masovia
Siemowit I of Masovia, was a Polish prince member of the House of Piast, Duke of Czersk during 1247–1248, Duke of Masovia during 1248–1262, ruler over Sieradz during 1259–1260.
Everything about Siemowit I of Masovia →- Born
- 1215, 1224
- Died
- June 23, 1262