Leszek II was the eldest son of Duke Casimir I of Kuyavia and his second wife Constance , daughter of Henry II the Pious from the Silesian branch of the Piast dynasty .
Head entity: silesian Q1929625 26
Tail entity: piast dynasty Q201615 30 31
Relation (head \u2192 tail): P361
Inverse relation (tail \u2192 head): P527