Casimir II of Łęczyca
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Casimir II of Łęczyca (Polish: Kazimierz II łęczycki; c. 1261/62 – 10 June 1294[1]) was a Polish prince member of the House of Piast, Duke of Brześć Kujawski during 1267–1288, Duke of Dobrzyń during 1275–1288 and Duke of Łęczyca since 1288 until his death.
He was the fourth son of Casimir I of Kuyavia, but the second born from his third marriage with Euphrosyne, daughter of Casimir I of Opole. He was probably named after both his father and maternal grandfather.