Among the Norman leaders the house of Hauteville stands out preëminently, both as the dominant force in this formative period and as the ancestor of the later princes of southern Italy and Sicily. The head of the family, Tancred, held the barony of Hauteville, in the neighborhood of Coutances, but his patrimony was quite insufficient to provide for his twelve sons, most of whom went to seek their fortune in the south, an elder group consisting of William of the Iron Arm, Drogo, and Humphrey, and a younger set of half-brothers, of whom the most important are Robert Guiscard and Roger. At the outset scarcely distinguishable from their fellow-warriors, _li fortissime Normant_ of their historian Aimé, the exploits of these brothers are celebrated by the later chroniclers in a way which reminds us less of sober history than of the heroes of the sagas or the _chansons de gestes_. William of the Iron Arm and Drogo seem to have arrived in the south about 1036 and soon signalized themselves in the first invasion of Sicily and in the conquest of northern Apulia, where William was chosen leader, or count, by the other Normans and at his death in 1046 succeeded by Drogo, who was soon afterward invested with the county by the Emperor Henry III. It was apparently in this year that Robert Guiscard first came to Italy. Refused assistance by his brothers, he hired himself out to various barons until he was left by Drogo in charge of a small garrison in the mountains of Calabria. Here he lived like a brigand, carrying off the cattle and sheep of the inhabitants and holding the people themselves for ransom. On one occasion he laid an ambush for the Greek commandant of Bisignano whom he had invited to a conference, and compelled him to pay twenty thousand golden _solidi_ for his freedom. Brigand as he was, Robert was more than a mere bandit. His shrewdness and resourcefulness early gained him the name of Guiscard, or the wary, and his Byzantine contemporary, the princess Anna Comnena, has left a portrait of him in which his towering stature, flashing eye, and bellowing strength are matched by his overleaping ambition and desire to dominate, his skill in organization, and his unconquerable will. Allied by marriage to a powerful baron of the south, he soon began to make headway in the conquest of Calabria, and while Drogo and his brother Humphrey were jealous of Robert’s advancement, at Humphrey’s death in 1057 he was chosen to succeed as count and leader of the Normans. Leaving to the youngest brother Roger, just arrived from Hauteville, the conquest of Calabria and the first attempts on Sicily, Guiscard gave his attention particularly to the affairs of Apulia, and after a series of campaigns and revolts completed the subjugation of the mainland by the capture of Bari in 1071. Five years after the battle of Hastings the whole of southern Italy had passed under Norman rule. The south had been conquered, but for whom? Robert was no