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About Siemowit III, Duke of Masovia
Siemowit III of Masovia was a prince of Masovia and a co-regent of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia.
Everything about Siemowit III, Duke of Masovia →- Citizenship
- Poland
- Born
- 1314
- Died
- June 16, 1381