Casimir III of Płock, was a Polish prince and member of the Masovian branch of the House of Piast.
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Casimir III of Płock, 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, 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, Płońsk and Zawkrze until his abdication in 1480, and Bishop of Płock during 1471-1480.
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