William II of Sicily
He was the second son of Count Tancred of Lecce and his wife Sibylla of Acerra. When in 1189 King William II of Sicily died childless, Tancred, an illegitimate son of the Norman duke Roger III of Apulia gained the support of Pope Clement III to be crowned King of Sicily, denying the rights of his aunt Constance, daughter of late King Roger II.