Ancestral File Number: 9FP0-57.
The Political History of England, Vol II, George Burton Adams Longmans Green and Co, 1905, Ch X, p217:
 "It is natural to suppose that the many barons who now declared against the king, and fortified their castles, were influenced by a knowledge of Robert's action, or at least by a knowledge that it was coming. No one of these was of the rank of earl. William Peverel, Ralph Lovel, and Robert of Lincoln, William Fitz John, William of Mohun, Ralph Paganel, and William Fitz Alan, are mentioned by name as holding castles against the king, besides a son of Robert's and Geoffrey Talbot who were at Bristol, and Walkelin Maminot who held Dover. The movement was confined to the southwest, but as a beginning it was not to be neglected..."
Ancestral File Ver 4.10 9FP0-57.
William married Catherine COURTENAY, daughter of Earl Hugh De Courtenay DEVON, III and Margaret De BOHUN. (Catherine COURTENAY was born about 1335 in Exeter, Devonshire, England.)