|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 9, page 367 (as modified by volume 14):
He [William d'Aubigny (d. 1139)] m. Maud, da. of Roger LE BIGOD, probably by his 2nd wife, Alice, sister and coh. of William de TOSNY, Lord of Belvoir, da. of Robert de TOSNY, of the same ...
On the question of whether Roger Bigod had one wife or two, see Norfolk, vol. 9, pp. 577-579.
Volume 9, page 384, note g:
Her [Elizabeth's, daughter of John, Lord Segrave, wife of John, Lord Mowbray (d. 1368)] eldest da., Alienore, was b. shortly before 25 Mar. 1364 (Cal. Patent Rolls, 1367-70, p. 237). She m. John, s. and h. of Sir John de Welle or Welles. See WELLES.
For the dates of Eleanor's birth and marriage, see Welles, vol. 12, part 2, pp. 442, 443.
[This question was also discussed, in February and May 2002, by Brad Verity.]