Robert of Hauteville called Scalio, was the third and youngest son of Robert Guiscard

Robert Guiscard

Robert d'Hauteville, known as Guiscard, Duke of Apulia and Calabria, from Latin Viscardus and Old French Viscart, often rendered the Resourceful, the Cunning, the Wily, the Fox, or the Weasel was a Norman adventurer conspicuous in the conquest of southern Italy and Sicily...

, Duke of Apulia, and his second wife Sikelgaita

Sikelgaita

Sikelgaita was a Lombard princess, the daughter of Guaimar IV, Prince of Salerno, and second wife of Robert Guiscard, Duke of Apulia....

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He may have served his elder half-brother Bohemond and his father in their Balkan expeditions of 1084–1085. He was a loyal servant of his eldest brother Roger Borsa

Roger Borsa

Roger Borsa was the Norman Duke of Apulia and effective ruler of southern Italy from 1085 until his death. He was the son of Robert Guiscard, the conqueror of southern Italy and Sicily; Roger was not as adept as his father, and most of his reign was spent in feudal anarchy.-Biography:Roger was the...

, whom he accompanied to Palermo

Palermo

Palermo is a city in Southern Italy, the capital of both the autonomous region of Sicily and the Province of Palermo. The city is noted for its history, culture, architecture and gastronomy, playing an important role throughout much of its existence; it is over 2,700 years old...

in 1086. He undersigned various documents of Roger's and died in April 1110.