Hasculf FitzEudo de Saint-Hilaire-du-Harcouët

With Ralph de Fougeres, Hasculf de St-Hilaire led a revolt in 1173 (Power, 2004, p. 276).

In "Henry II: new interpretations" (2007), historians Christopher Harper-Bill and Nicholas Vincent mention Hasculf as well:

Where some contemporaries saw the hand of Eleanor, her uncle Ralf de Faye, and Louis of France behind the outbreak of the rebellion of 1173, the most immediate sources of discontent came from within the Young King's own household. Henry II had removed Hasculf de Saint-Hilaire and 'other young knights...from the counsel and household of his son...', doubtless because they had been urging him to press his father for independent rule, and it was this purge that Torigni regarded as the immediate cause of the Young King's escape from his father's ministers and his flight via Argenteuil to Louis VII. (2007, p. 207; found on books.google.com)

Chart of the Saint-Hilaire (Saint-James) family tree to be found on page 516 in "The Norman frontier in the twelfth and early thirteenth centuries," by Daniel Power. http://books.google.com/books?id=UrjF6T6JZvYC&lpg=PP1&dq=the%20norm...