General Notes

Rollo, or Fulbert, chamberlain to Robert, Duke of Normandy, had the giftof the castle and honor of Croy, in Picardy, from whence his posterityassumed their surname, which was afterwards written de Grey. They had adaughter Hervela or Herlotta, who was the mother of William, theConqueror, and a son, Reynold.
Sources: Burke's Dormant and Extinct Peerage, p. 248.
               Edmondson's Baronagium Genealogicum, Vol. 1, p. 77; Vol.4, p. 340.
               Glover's History and Gazeteer of Derbyshire, Vol. 2, pp.308/9.
               Lipscomb's History of Buckinghamshire, Vol. 1, pp. 160,466.
               Banks Dormant and Extinct Baronage, Vol. 2, p. 224.
               Lewis' Manuscripts, pp. 154, 267.
               Cokayne's Complete Peerage of Great Britain, Vol. 4, pp.308-311, 761,
               Appendix No. 1.