Robert married Sybilla of Conversano , daughter of Geoffrey of Brindisi , Count of Conversano ( and a grandniece of Robert Guiscard , another Norman duke ) on the way back from Crusade , one child : Sybilla , who was admired and often praised by chroniclers of the time , died shortly after the birth .
Robert married Sybilla of Conversano , daughter of Geoffrey of Brindisi , Count of Conversano ( and a grandniece of Robert Guiscard , another Norman duke ) on the way back from Crusade , one child : Robert also had at least three illegitimate children :