He was Lord of Montfort-sur-Risle, Constable of Normandy and a companion of William the Conqueror.
[1] The son of Hugh "the Bearded" de Montfort-sur-Risle, Montfort was an early ally of William, fighting in the Battle of Mortemer in 1054, a defeat for King Henry I of France.
He participated in the Council of Lillebonne in January 1066 where the decision to invade England was made.
In support of the actual invasion, Hugh provided 50 ships and 60 knights.
[2] In return, Hugh was installed at William's fortress at Winchester, and he received numerous holdings in Essex, Kent, Norfolk and Suffolk.