Tancred, Prince of Bari

Tancred of Hauteville (c. 1119 – 1138), the second son of King Roger II of Sicily and his first wife, Elvira of Castile, was the Prince of Bari and Taranto from 1132 to 1138.

He was named by his father to replace the rebellious Grimoald, Prince of Bari, in 1132. He was only about thirteen or fourteen years old at the time. When he grew to adulthood, he became, along with his brothers Roger, duke of Apulia, and Alfonso, prince of Capua, one of his father's chief men on the peninsula, while the king himself remained mostly in Sicily. He died young in 1138 and William, his other brother, inherited his estates and titles.

...
Wikipedia