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By 1321, Casimir I married Euphemia (b. 1310 – d. aft. 11 January 1374), daughter of Duke Trojden I of Czersk-Warsaw.
After the lost 1164 Battle of Verchen, where Casimir and Bogislaw aided an Obodrite rebellion against the duke of Saxony, Henry the Lion, Casimir and Bogislaw joined Saxony receiving their respective part duchies as a fief from Henry the Lion.
She was the fourth daughter and youngest child of Casimir I, Duke of Cieszyn, by his wife Euphemia, daughter of Duke Trojden I of Czersk-Warsaw.