William of the Principate Norman noble (1020–1080) Parents Fressenda of Hauteville Tancred of Hauteville Children Richard of Salerno Siblings Serlo I of Hauteville Geoffrey of Hauteville Humphrey of Hauteville Roger I of Sicily Mauger of Hauteville William Iron Arm Robert Guiscard Drogo of Hauteville Humbert de Hauteville Fredesenda de Hauteville Béatrice de Hauteville Partners Maria di Sorrento