Siemowit III of Masovia

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Princely seal of Siemowit III; ca. 1355
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Princely seal of Siemowit III; ca. 1355
Administrative division of Masovia (1313-1345)
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Administrative division of Masovia (1313-1345)

Siemowit III of Masovia (his name also rendered Ziemowit; ca. 1320-1381) 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. A tributary to the king of Poland Casimir III, since 1370 he was a sovereign ruler of his domain. He granted his sons with separate domains centred around Warsaw and Rawa, leaving the core of his domain with Płock under his direct rule.

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