The following information was contained in a post-em from Curt Hofemann:
Count d'Ivry [Ref: Tompsett, Wm Conqueror]
half-brother: Richard I Duke of Normandy [Ref: ES III:694A]
...Richard the Fearless' mother, Espriota, married, in the troublous times of his boyhood, a rich countryman called Sperling. They had a son called Raoul of Ivry, who seems to have been high in power and favor with the second Richard, his half-brother... [Ref: The Normans by Sarah Orne Jewett, Chapter V, DUKE RICHARD THE GOOD http://www.public.coe.edu/~theller/soj/nor/nor05.html]
Douglas mentions a 'half' brother of Richard, who assumed the title of count between 1006 and 1011. p.89 A clearer example of the acquisition by a feudal family of lands which had earlier been part of the ducal demesne, can be seen in the descent of the possessions of Count Rudolf, half-brother to Duke Richard I. Among the lands held by this man were estates situated on the Risle near Saint Philibert; estates on the Eure, including Concherel, Jouy, and, it would seem, Pacy; lands dependent on Breteuil; and lands centred on Ivry. Many of these lands, particularly those on the Eure, were inextricably intermingled with the earliest demesne of the Norman duke and must have come to Rudulf through his stepfather or his half-brother. Their subsequent devolution is thus of particular interest. Part of Ivry lands went to the count's eldest son Hugh, bishop of Bayeux, while the barony of Saint Philibert passed through the count's second son, John bishop of Avranches, to that cathedral church. But the larger part of Rudolf's possessions, including the honour of Pacy and the district honour of Breteuil, descended through the count's daughter, Emma, to her husband Osbern, the steward of Duke Robert I, and one of the guardians of the infant William. [Ref note: the previous URL of the online source of this is no longer valid & a google.com search did not show a new URL ... Curt 01/01/03]
The ducal family of Normandy early determined to have an historiographer whom they sought in France, one Dudon, dean of the chapter of St. Quentin, who between 1015-30 wrote in Latin half verse, half prose, a history of the family according to the traditions and accounts transmitted to him by Raoul, Count of Ivry grandson of Rollo and brother of Richard I Alinea. [Ref: Catholic Encyclopedia http://www.newadvent.org/cathen/11104a.htm]
Happy New Year!
Regards,
Curt