Casimir III of Płock

Casimir III of Płock (pl: Kazimierz III płocki; 10 June 1448/8 June 1449 - 9 June 1480), was a Polish prince and member of the Masovian branch of the House of Piast. He was a Duke of Warsaw, Nur, Łomża, Liw, Ciechanów, Wyszogród and Zakroczym during the period 1454-1471 jointly with his brothers (under regency until 1462), Duke of Płock, Płońsk, Zawkrze and Wizna from 1462 to 1471, and after the division of the paternal domains in 1471, sole ruler over Płock, Wizna, Wyszogród (until 1474), Płońsk and Zawkrze until his abdication in 1480, and Bishop of Płock during 1471-1480 (as secular administrator until 1475).

He was the fifth son of Bolesław IV of Warsaw and Barbara Olelkovna of Slutsk-Kapy, a Lithuanian princess, (granddaughter of Vladimir Olgerdovich). The premature death of three of his older brothers during 1452-1454 left him as the second surviving son of his family.

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