This family is of great antiquity, both in England and France, fromwhence the first one in England, who came with William the Conqueror, wasRobert de Oilly and Nigel, his brother, who succeeded him. Sources: Nichols Topographer and Genealogist, Vol. 1, pp. 368-373. Bank's Dormant and Extinct Baronage, Vol. 1, p. 67.The name D'Oylywas also D'Oilly, de Oilly and later Doyley before it became the D'Oylyspelling. Nigel was the Constable of Oxford Castle