Guillaume de Livet, master of arts and bachelor of law, canon of Lisieux, was received as canon of the church of Rouen by virtue of letters patent of the King of England in 1431.

He was at various times promoter of the archiepiscopal See, for a while around 1414, and from 1436 to 1443- We note that in 1444 Guillaume de Livet was named commissioner of the canons for a treaty to be concluded between them and the archbishop; and we find him as a deputy at the Estates of Normandy in 1449.

He died at Rouen, very old doubtless, on January 22, 1465, bearing in addition the title of curé of Saint Maclou.

This man of the law decided in accordance with the deliberations of the Faculty of Law at Paris; in the final sentence he took refuge in the authority of the Abbot of Fécamp Guillaume de Livet was not among the witnesses called at the time of the Rehabilitation.