Leszek II the Black
Ultimately, however, Casimir I refused to return Ląd, and this caused the coalition to attack again in 1261. Leszek II the Black, Casimir I's eldest son, took advantage of his father's difficult position and demanded his own district, using as an excuse the intrigues of his stepmother, who wanted to obtain more land for her own children. In the end, Casimir I was forced to not only surrender the castellany of Ląd, but to also give Sieradz to his son as a separate district.