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Siemowit III of Masovia (alternatively Ziemowit III; c. 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. Life. Siemowit was the second son of Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia.
May 3, 2024 · After working his whole life on reuniting Masovia and making it an independent state, Siemowit III died on June 16, 1381 and was buried at Plock Cathedral. History iemowit III of Masovia (his name also rendered Ziemowit; c. 1320 – 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw ...
Wenceslaus became Duke at Płock (until 1336), followed by his son Bolesław III (until 1351) As neither Siemowit II nor Bolesław III of Płock left any heirs, Trojden's son Duke Siemowit III (1341–1381) was able to re-unite most of the Masovian lands under his rule; in 1351 he and his brother Casimir became vassals of the Polish kings ...
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Children of Siemowit III, divided their inheritance. Janusz was, after 1391, Duke of Podlasie. Siemowit lost much of his domain to the Teutonic Order in 1382 (Wizna, Zawkrze, Płońsk), but gained Bełz from Poland. Siemowit IV the Younger: 1353 Second son of Siemowit III and Euphemia of Opava: 16 June 1381 – 21 January 1426: Duchy of Płock
Siemowit III of Masovia (his name also rendered Ziemowit; c. 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.
Having a reunified Masovia, it regained its independence, there Siemowit III promulgates a customary law in 1377. He reformed the administration, justice and the monetary system. In 1373/1374 he gave the regions of Warsaw and Rawa to his sons, Siemowit IV of Masovia and Janusz I of Warsaw .
Language Label Description Also known as; English: Siemowit III, Duke of Masovia. Polish nobleman
