About 1015 two illegitimate sons of Duke Richard I, Godfrey and William, became counts, the latter being count of Eu; and after their deaths, Gilbert of Brionne, the son of Godfrey, was a count, whilst William's son, Robert, was before 1047 recognized as count of Eu.153

Cockayne's "Complete Peerage" calls him the Count of Brionne and states that he was the illegitimate son of Richard, Duke of Normandy.