(Research):"Mauger's second son was Hamon, nicknamed Dentatus, from having been born, it is said, with teeth. He is styled Earl of Corbeil, and in several of the old French historians the seigneuries of Thorigny, Granville, Breuilly, Creuilly, Bercy and Maisy are assigned to him…. Corbeil sur Seine was situated between Paris and Fontainbleau and contained two Collegiate Churches founded by Hamon the first Earl…. When Dennis Granville, Dean of Durham, went into exile for his faithful adherence to the cause of his royal master, James II, he lived for some time at Corbeil and discovered the tomb of his great ancestor, which he described as very magnificent, and bearing the same arms as were then borne by his family. Thorigny was a fortified town upon the borders of Bayeux and Coutance. Creuilly was near Caen, and the castle, a construction of different ages, still exists and is now converted into a dwelling house. Maisy is described as "le commune littoral du Bessin." Bruilly or Bercy are unknown, the names not being found in any of the maps of France or Normandy, whilst the little Norman sea-port of Granville is of course still extant and well-known. Its situation on the coast between Avranches and Coutances is singular; it is built in steps or terraces under a rocky promontory projecting into the sea, surmounted by its ancient fort whose presence restricts many of the buildings from rising above one story in height. Previously to the bombardment of the British at the end of the seventeenth century, the Granville arms existed on one of the citadel gates.
"Little or nothing is known of the life of Hamon Dentatus, but the old historians state that he and his brother Guillerin took part in the rebellion of the principal Norman barons against the young Duke William's ascension on the ground of his illegitimacy, and that both were slain in the celebrated Battle of the Valley of the Dunes. In a note of Robert Wace's quaint poetry, "Le Roman de Rou et des Ducs de Normandie," it is stated that Hamon fell valiantly attacking the King of France, who had come to the assistance of the young Duke. His body was taken to Essay and there interred before the door of the Church. He had married Hadwise or Avoye (in some English pedigrees she is called Elizabeth d'Avoye) the widow of Hugh the Great, Duke of France, sister to the Emperor Otho, and daughter of Henry l'Oiseleur. By her Hamon left three sons, namely, Robert Fitzhamon; Richard called, as was customary, de Granville, after one of his father's Lordships, and Hamon.