[1] Under his episcopacy he completed the reconstruction of the cathedral, originally begun by his predecessor, Herbert of Lisieux, and proceeded his dedication according to the Neustria Pia on 8 July 1060.
He organized the cathedral chapter, composed of a dean, a treasurer and a cantor, and brought to the diocese a number of distinguished priests, many educated there at Hugh's instruction.
[2] In 1050, Hugh, together with his brother and mother, founded the abbey of Saint-Désir de Lisieux, composed of nuns from Saint-Pierre-sur-Dives and later Benedictine monks.
On October 7, 1050, he blessed Thierry de Mathonville, the first abbot of the abbey of Saint-Évroult since its restoration and later both Osberne in 1061 and Mainier d'Échauffour, in 1066.
[2] Marjorie Chibnall, however, suggests that it may instead be due to the rebellion of Robert Giroie, to whom the de Grandmesnils owed allegiance.
[2] This dispute led to abbot Robert fleeing Saint-Evroul, and seeking the protection of Pope Nicholas II.