Complete Peerage 2 Pt. 2 (1959): 659-660 has a good account of the
life of John Willoughby, 3rd Lord Willoughby of Eresby (died 1372).
Regarding his marriage, the author states:
"He married before 1349, Cecily, sister and (in her issue) coheiress
of William (de Ufford), 2nd Earl of Suffolk, 2nd but 1st surviving
daughter of Robert, 1st Earl of Ufford, by Margaret, great-aunt and
(in her issue) heiress of John (de Norwich), 2nd Lord Norwich,
daughter of Sir Walter de Norwich, of Sculthorpe, Norfolk."
The item below was recently found in the helpful online A2A Catalogue
(http://www.a2a.org.uk/search/index.asp). It shows that John
Willoughby and his wife, Cecily, were married before 18 August 1337,
when his father settled the manor of Fulstow on them. This grant was
made when John was aged 8 years old, as Complete Peerage shows that he
was born at Eresby manor and baptized 6 January 1328/9 in the church
of St. James, Spilsby, Lincolnshire. As such, it appears that John
and Cecily were married (or contracted to marry) when they were small
children.
Best always, Douglas Richardson, Salt Lake City, Utah
E-mail: douglasr...@royalancestry.net
Website: www.royalancestry.net
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Source: A2A Catalogue
Lincolnshire Archives: Holywell
Reference: Holywell 87/52
Creation dates: 18 August 1337
Scope and Content
Cyrograph grant by John de Wylughby lord of Eresby to John his son and
Cecilia his wife of the manor of Fulstow; they and their heirs are to
hold it at the rent of a rose, unless heirs foil, in which case it is
to return to the grantor.
Witnesses:- Walter de Hamby, John Urens, Henry de Halton, John de
Urens de Lotheburgh, John de Londham, Thomas de Neumarche, John
Manent, Hugh de Saxham, knights, William Hauley, Roger Sibill.