A charter dated 1100 included in the cartulary of Saint-Josse records a grant of fishing rights by "Guido comes Monsteroli et Pontivensium" which names "Hugo noster avus" and "patre meo Ingerrano". This is inconsistent with the Chronique de Saint Riquier which records that "comte Gui fils du comte Hugues" succeeded after "Angelran son frère" was killed by the Normans and possessed the county of Ponthieu and the avouerie of Saint-Riquier. It is assumed that the charter provides the more reliable record of Guy's parentage.
Comte de Montreuil. Comte de Ponthieu. Orderic Vitalis records that Guy fought with "Ralph Comte de Montdidier", in support of Henri I King of France, in Feb 1054, was captured by Guillaume II Duke of Normandy and kept prisoner for 2 years until he paid homage to the duke. "Pontivensium comes Wido" donated property to Compiègne Saint-Corneille, confirmed by "Anne comitisse nostre filie", by charter dated to [1067 or after]. A charter dated 1100 records the foundation of the priory of St-Pierre d’Abbeville by "Guy comte de Ponthieu et Adèle sa femme", sealed by "Guy comte, de Agnèz sa fille, de Mahaut sa fille…". "Wido…Pontivi regionis comes" issued a charter dated 1101 relating to the church of Montreuil witnessed by "Agnetis mee filie, Hugonis filii Ramelini cum Ade sue conjugis, Widonis filii Hermenfredi, Simonis Rogeronis filii, Godefridi vicecomitis…Wascelini tunc temporis vicecomitis Monsteroli et ville Rue…". 2
Also referred to as Guy DE MONTREUIL