High Quality Content by WIKIPEDIA articles! 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 (c. 1015 - 17 July 1085) was a Norman adventurer conspicuous in the conquest of southern Italy and Sicily. Robert was from the noble Maison d'Hautville of the Hauteville family, he went on to become Count (1057-1059) and then Duke (1059-1085) of Apulia and Calabria after his half-brother Humphrey's death.