Leszek II the Black
After the death of his father in 1267, Casimir II, together with his full-brothers, inherited their share of his lands under the regency of their mother until 1275, when they jointly ruled. Casimir II inherited his own domain in 1288, when after the death of his childless half-brother Leszek II the Black he received the Duchy of Łęczyca, situated in the centre of Poland.