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Casimir I of Warsaw (pl: ''Kazimierz I warszawski''; 1329/31 – 26 November/5 December 1355〔J. Grabowski: ''Dynastia Piastów mazowieckich'', Kraków 2012, p. 444.〕), was a Polish prince member of the House of Piast, Duke of Czersk during 1341-1349 jointly with his brother, since 1345 ruler over Rawa Mazowiecka jointly with his brother, since 1349 sole ruler over Warsaw, since 1351 sole ruler over Sochaczew, Polish vassal since 1351. He was the third and youngest son of Trojden I of Czersk and Maria, daughter of Yuri I, King of Halych-Volhynia. ==Life== After the death of his father in 1341, Casimir I ruled jointly with his oldest surviving brother Siemowit III, and four years later (1345), both brothers inherited Rawa Mazowiecka from their uncle Siemowit II. The formal division of the paternal inheritance took place in 1349, when Casimir I received the small district of Warsaw, being the first time that this district became in the capital of a Piast Dukedom. In 1351, Casimir I increased his patrimony with the district of Sochaczew, who he received after the death of his cousin Bolesław III. On 18 September 1351, Casimir I and Siemowit II decided to paid homage to the Polish King Casimir III the Great. In return of their submission, the Masovian Dukes received the promise that if the King died without sons, the entire inheritance of Bolesław III passed to them. In fact, they received the main district of Bolesław III, Płock immediately, but in exchange of a payment of 2,000 fines. Casimir I died between 26 November and 5 December 1355 and was buried at Płock Cathedral. Because he never married or had children, his district of Warsaw as an emptied fief was reverted to King Casimir III; however, he agreed to transfer the entire estate to Siemowit III in exchange of a monetary compensation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Casimir I of Warsaw」の詳細全文を読む スポンサード リンク
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