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m. Abt 1309
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m. Abt 1335
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Facts and Events
Siemowit III of Masovia (his name also rendered Ziemowit; – 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia.
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