Tancred of Hauteville one of many of that name, was the Prince of Bari

Bari

Bari is the capital city of the province of Bari and of the Apulia region, on the Adriatic Sea, in Italy. It is the second most important economic centre of mainland Southern Italy after Naples, and is well known as a port and university city, as well as the city of Saint Nicholas...

 and Taranto

Principality of Taranto

The Principality of Taranto was a state in southern Italy created in 1088 for Bohemond I, eldest son of Robert Guiscard, as part of the peace between him and his younger brother Roger Borsa after a dispute over the succession to the Duchy of Apulia....

 from 1132 to 1138.

He was the second son of Roger II of Sicily

Roger II of Sicily

Roger II was King of Sicily, son of Roger I of Sicily and successor to his brother Simon. He began his rule as Count of Sicily in 1105, later became Duke of Apulia and Calabria , then King of Sicily...

 and his first wife Elvira of Castile

Elvira of Castile (Sicilian queen)

Elvira of Castile was the first Queen of Sicily.- Background and upbringing :She was a daughter of Alfonso VI of Castile by his fourth queen, Isabella...

. His maternal grandparents were Alfonso VI of Castile

Alfonso VI of Castile

Alfonso VI , nicknamed the Brave or the Valiant, was King of León from 1065, King of Castile and de facto King of Galicia from 1072, and self-proclaimed "Emperor of all Spain". After the conquest of Toledo he was also self-proclaimed victoriosissimo rege in Toleto, et in Hispania et Gallecia...

 and his queen Isabel, possibly the same person as Zaida, converted daughter-in-law of al-Mutamid of Seville

Seville

Seville is the artistic, historic, cultural, and financial capital of southern Spain. It is the capital of the autonomous community of Andalusia and of the province of Seville. It is situated on the plain of the River Guadalquivir, with an average elevation of above sea level...

.

He was named by his father to replace the rebellious Grimoald, Prince of Bari

Grimoald, Prince of Bari

Grimoald Alferanites was the prince of Bari from 1121 to 1132.After a civil war broke out in Bari, Risone, the archbishop of the city, was murdered and the princess of Taranto, Constance of France, was imprisoned at Giovinazzo by Grimoald and Alexander, Count of Conversano...

, in 1132. He was only about fifteen or sixteen years old at the time. When he grew to adulthood, he became, along with his brothers Roger

Roger III, Duke of Apulia

Roger III was the Norman duke of Apulia from 1135. He was the eldest son of King Roger II of Sicily and Elvira of Castile....

, duke of Apulia, and Alfonso

Alfonso of Hauteville

Alfonso of Hauteville , third son of Roger II of Sicily and Elvira of Castile, was the prince of Capua from 1135 to his death.He was named after his maternal grandfather, Alfonso VI of Castile...

, prince of Capua, one of his father's chief men on the peninsula, while the king himself remained mostly in Sicily

Sicily

Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

. He died young in 1138 and William

William I of Sicily

William I , called the Bad or the Wicked, was the second king of Sicily, ruling from his father's death in 1154 to his own...

, his other brother, inherited his estates and titles.