Gilbert's father was Ralf Alost. His paternal grandfather was Adalbert of Saxony. He was an only child. He died in 1095.
General Notes
Son of Ralf, Count of Alost (now Aalst) or Gand, Flanders; one of the richest Norman barons in England. Burke's DEP claims that Gilbert's father was a brother-in-law of William the Conqueror, but no other genealogy supports this view.
Children 1. Hugh De Montfort 2. Walter De Gant 3. Walter De Lindesay 4. Robert De Gant 5. Emma De Gant