I found this today on wikipedia about the Barons of Loughmoe, someone on this site posted a link to it.
"As noted by O'Hart, according to a tradition, Sir Hugh was the first Norman to land at Pevensey Bay, the first to do a deed of Arms by storming the ruins of the old Roman Castle, where a party of Harold's soldiers lay entrenched, and the first to win a grant of land from William the Conqueror in 'guerdon of the deed' . No evidence exists to support this claim. Hugh's son Dyno, however, was Keeper of the Bedchamber to William the Conqueror, a strong indication of military association between the Purcells and the King."
Does anyone know who O'Hart was? A historian?