Mauger of Hauteville was a younger (probably the second) son of Tancred of Hauteville

Tancred of Hauteville

Tancred of Hauteville was an 11th-century Norman petty lord about whom little is known. His historical importance comes entirely from the accomplishments of his sons and later descendants...

 by his second wife, Fressenda. He travelled to the Mezzogiorno

Mezzogiorno

The Midday is a wide definition, without any administrative usage, used to indicate the southern half of the Italian state, encompassing the southern section of the continental Italian Peninsula and the two major islands of Sicily and Sardinia, in addition to a large number of minor islands...

 with his brother William

William of the Principate

William of Hauteville was one of the younger sons of Tancred of Hauteville by his second wife Fressenda. He is usually called Willermus instead of Wilelmus in Latin annals and so is often called Guillerm instead of Guillaume in French...

 and his elder half-brother Geoffrey

Geoffrey of Hauteville

Geoffrey of Hauteville was a Norman military leader, the second youngest son of Tancred of Hauteville by his first wife Muriella. He joined his brothers in the Mezzogiorno around 1053, arriving with his half-brothers Mauger and William...

 around 1053, though some sources indicate him coming later, c.1056.

He soon distinguished himself and was invested with the county of the Capitanate soon after his arrival (either 1053 or 1057) by Humphrey

Humphrey of Hauteville

Humphrey of Hauteville , surnamed Abagelard, was the Count of Apulia and Calabria from 1051 to his death.Humphrey was probably the youngest son of Tancred of Hauteville by his first wife Muriel. Some sources make Geoffrey and Serlo his younger brothers...

, his half brother and count of Apulia, but he did not long survive to hold it. According to Goffredo Malaterra

Goffredo Malaterra

Gaufredo Malaterra was an eleventh century Benedictine monk and historian, possibly of Norman origin. He travelled to the southern Italian peninsula, passing some time in Apulia before entering the monastery of Sant'Agata at Catania, on the isle of Sicily...

, he died in 1054, though other chroniclers have him dying in 1057 or as late as 1060, after assisting his elder full brother 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...

, Humphrey's successor, in an expedition against the new army of the Byzantine Emperor Constantine X

Constantine X

Constantine X Doukas was emperor of the Byzantine Empire from 1059 to 1067.-Reign:Constantine Doukas was the son of Andronikos Doukas, a Paphlagonian nobleman who may have served as governor of the theme of Moesia...

, sent to recover Langobardia. Whenever he died, his fief went to William, who passed it to Geoffrey out of fraternal affection (according to Malaterra).

Sources

• Chalandon, Ferdinand. Histoire de la domination normande en Italie et en Sicile. Paris
  Paris
  Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...
  
  , 1907.
• Norwich, John Julius
  John Julius Norwich
  John Julius Cooper, 2nd Viscount Norwich CVO — known as John Julius Norwich — is an English historian, travel writer and television personality.-Early life:...
  
  . The Normans in the South 1016-1130. Longmans: London
  London
  London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...
  
  , 1967.