A possible clue for her identity was given by C.V. Collier and Henry
Lawrance in Yorkshire Archaeological Journal (YAJ) 25:80 (1918), who
said Elizabeth was the daughter of Ralph Neville of Stainton,
Lincolnshire. They added that Robert and Elizabeth were buried at
Butterwick, citing YAJ 2:201.
The articles on the Greystoke family in "Complete Peerage", I.J.
Sander's "English Baronies", C. Clay's "Early Yorkshire Families",
and J. Wilson in Ancestor v.6, had no additional information.
Ray Phair