Category:Casimir I, Duke of Kuyavia

**Casimir I of Kuyavia**
	Polish prince (c. 1211 – 1267)
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Date of birth	1211 (statement with Gregorian date earlier than 1584)
Date of death	14 November 1267 (statement with Gregorian date earlier than 1584); Inowrocław
Place of burial	Poland;
Occupation	aristocrat;
Noble title	duke;
Family	Piast dynasty;
Father	Konrad I of Masovia;
Mother	Agafia of Rus;
Sibling	Judith of Masovia; Siemowit I of Masovia; Bolesław I of Masovia;
Child	Leszek II the Black; Ziemomysł of Kuyavia; Władysław I the Elbow-high; Euphemia of Kuyavia; Casimir II of Łęczyca; Siemowit, Duke of Kuyavia-Brieg;
Spouse	Constance of Wrocław (1239–); Euphrosyne of Opole (1257–); Jadwiga (–1235);
Authority file
	Q936880; VIAF cluster ID: 316785813; GND ID: 1074779487
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