|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 5, page 254:
He [Sir John Cornwall, later Lord Fanhope (d.1443)] m., before 12 Dec. 1400, Elizabeth, the King's sister, widow of John (HOLAND), DUKE OF EXETER ... and 2nd da. of John, styled "OF GAUNT," DUKE OF LANCASTER, by his 1st wife, Blanche, ...
He had married previously, before 20 April 1399, Philippa, widow of Sir Richard Sergeaux (d.1393) and daughter and coheir of Sir Edmund de Arundel, bastardised son of Richard, 9th or 2nd Earl of Arundel (d.1375/6); Philippa died 13 September 1399.
In 1396 and 1396/7, Philippa, the widow of Sir Richard Sergeaux, daughter and one of the heirs of Sir Edmund Darundell, knight, had quitclaimed all lands etc sometime of Richard, Earl of Arundel and Surrey, deceased, except specified manors in Sussex, which her husband had given to the present earl in exchange for the manor of Chipping Norton [Cal. Close Rolls, 1396-99, pp.72, 84]. On 20 April 1399, the manor of Chipping Norton, as held by Richard, late Earl of Arundel, was granted to Sir John Cornewaille and Philippa his wife [Cal. Patent Rolls, 1393-99, p.516]. The inquisitions taken after Philippa's death, 24 January and 24 March 1399/1400, according to which she died 13 September 1399, do not mention that she was the wife of Sir John Cornwall, but the Oxfordshire inquisition states that she held the manor of Chipping Norton of the king in chief, confirming her identity with the Philippa mentioned in the patent roll [Cal. Inq. p.m., vol.18, nos 31, 33].
(On the children of Sir Edmund de Arundel, see Arundel)
[This addition was provided by Douglas Richardson, November 2001. The marriage is also stated by Roskell et al., History of Parliament: The Commons, 1386-1421 (1992), though they do not provide any evidence.]