"Henricus comes Augensis filius comitis Willermi" made donations to the abbey of St Michel, Tréport with the consent of "Margarita comitissa et fratres supradicti comitis Robertus, Willelmus major, Willelmus minor" by a charter dated 1101.
He succeeded his father in 1096 as Comte d'Eu. In 1118, he supported a rebellion against Henry I King of England in favour of Guillaume "Clito" de Normandie, but was arrested at Rouen with Hugues de Gournay, "thrown into fetters and forced to surrender his castles". He founded Saint-Martin-du-Bosc in [1107] and the abbey of Fécamp in 1129/30. He became a monk at the abbey of Fécamp.
Married firstly Mathilde (d. 30 Mar 1107 or before). "Henricus comes Augensis" made donations to the abbey of St Michel, Tréport "pro salute anime Matildis uxoris mee" with the consent of "frater meus Robertus" by a charter dated 1107. The necrology of Ulterioris Portus monastery records the death "30 Mar" of "Maltildis Augensis comitissa, Henrici comitis...sponsa".
Married secondly Ermentrude (died 17 or 24 April). The necrology of Ulterioris Portus monastery records the death "17 Apr" of "Hermentrudis Augi comitissa". The necrology of Longpont records the death “VIII Kal Mai” of “Hermetrudis comitissa Augi”. The necrology of Longpont contains numerous references to the Montlhéry family, Comtes de Rochefort . . . The inclusion of Ermentrude suggests that she may be related to that family.
Robert of Torigny records the death in 1140 of "Henricus comes de Ou". The necrology of the church of Eu records the anniversary "12 Jul" of "Henrici comitis Augi" who introduced "canonicos regulares" to the church. 1
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