Siemowit III, Duke of Masovia
Polish nobleman · Poland · On the map · Lived 1314 to 1381 · aged 67
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.
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Lived 1314 to 1381 · aged 67