The first private individual to be styled count in Normandy was Rodulf of Ivry, half-brother of Duke Richard I, who assumed the title between 1006 and 1011, and thereafter several of the sons of that duke were similarly designated, perhaps by reason of their birth.153

Cockayne's "Complete Peerage" states that "Ralph, count of Ivry, was (on the mother's side) br. of the half blood to Duke Richard I [of Normandy]".