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Casimir I of Kuyavia

Casimir I of Kuyavia (Polish: Kazimierz I kujawski) (c. 1211[1] – 14 December 1267) was a Polish prince and a member of the House of Piast. He was Duke of Kujawy after 1233, ruler over Ląd from 1239-1261, ruler over Wyszogród after 1242, Duke of Sieradz from 1247-1261, Duke of Łęczyca after 1247, and Duke of Dobrzyń after 1248.

Casimir I of Kuyavia

c. 1211

(1267-12-14)14 December 1267

Cathedral of Włocławek

House of Piast

Jadwiga
Constance of Wrocław
Euphrosyne of Opole

Leszek II the Black
Ziemomysł
Władysław I the Elbow-high
Casimir II
Siemowit
Euphemia

Konrad I of Masovia

Agafia of Rus

He was the second son of Konrad I of Masovia and his wife Agafia of Rus. He was probably named after his grandfather, Casimir II the Just.