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  1. Other historians say this happened in 1351, in order to inherit from Boleslaw III of Płock who was a vassal of Bohemia. But on 18 September 1351 Siemowit and Casimir recognised the Polish King Casimir III the Great as suzerain, canceling the allegiance of Masovia and Bohemia.

  2. May 3, 2024 · 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, Czersk, Rawa, Gostynin and other parts of Masovia. Life.

  3. Duke of Masovia ( Polish: Książę Mazowsza) was a title borne by the sons and descendants of the Polish Duke Bolesław III Wrymouth. [1] In accordance with the last will and testament of Bolesław, upon his death his lands were divided into four to five hereditary provinces distributed among his sons, and a royal province of Kraków reserved ...

    Ruler
    Ruler
    Born
    Reign
    1093 Ehingen Daughter of Henry, Count of ...
    28 October 1138 – 27 July 1144
    Duchy of Masovia (at Łęczyca)
    1122 Third son of Boleslaus III of Poland ...
    28 October 1138 – 5 January 1173
    Regency of Casimir II of Poland ...
    Regency of Casimir II of Poland ...
    Regency of Casimir II of Poland ...
    Regency of Casimir II of Poland ...
    1162 Son of Boleslaus IV of Poland and ...
    5 January 1173 – 1186
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  5. Seal of Siemowit IV. Siemowit IV ( Ziemowit IV ), also known as Siemowit IV the Younger (pl: Siemowit IV Młodszy; ca. 1353/1356 [1] – 21 January 1426 [2] ), was a Polish prince, member of the Masovian branch of the House of Piast and from 1373 or 1374 Duke of Rawa, and after the division of the paternal inheritance between him and his ...

  6. 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 .

  7. Apr 30, 2022 · On 12 December 1385, few months after the Union of Krewo, Siemowit IV, Duke of Masovia, reached a compromise with king Jadwiga of Poland and her intended consort king Jogaila (Władysław II Jagiełło), brother of Alexandra.

  8. Siemowit III, Duke of Masovia. Polish nobleman. Upload media. Wikipedia. Date of birth. 1314 (statement with Gregorian date earlier than 1584) Date of death. 16 June 1381 (statement with Gregorian date earlier than 1584) Masovian Voivodeship.