He composed the Carmen de Hastingae Proelio, a celebration of the Norman victory at the Battle of Hastings in 1066.
[4] As the trusted representative of Bishop Fulk II, he was sent in 1049 to the papal curia to place charges against the abbot of Corbie.
This may have been the (contributing) reason why bishop Guy composed the Carmen de Hastingae Proelio ("Song of the Battle of Hastings"), as an effort to flatter the new Norman king of England, William I, who was then in very high favor with the pope.
In 1067, he gave an endowment to the abbey of Saint-Riquier in Ponthieu, which was witnessed by Count Baldwin VI of Flanders.
[7] He was highly enough thought of at the Norman court to be assigned as Matilda of Flanders's chaplain when she went over to England for her coronation in 1068.