Catherine Fitzalan 
Catherine was born about 1300 in Bedale, Yorkshire, England. She was an only child. She died before August 1328.General Notes
Catharine, daughter and heir of Sir Bryan fitz Alan. [Magna Charta Sureties]
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He [John de Grey] married, 1stly, before 1 March 1311/2, Catherine, younger daughter and coheir of Sir Brian (FITZALAN), LORD FITZALAN, by his 2nd wife, Maud. [Complete Peerage VI:145-7, (tanscribed by Dave Utzinger)]
‌Catherine and John 1St Baron De were married in a religious ceremony in 1st Wife.1 They had a son named John 2Nd Baron De.
Family Notes
_UIDDC6226647CCEB54D90A2D7F3C25E020F4103
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Children
John 2Nd Baron De Grey
John 2Nd Baron De was born before 1319 in Rotherfield Greys Castle, Henley-On-Thames, Oxfordshire, England.2 He died on June 4th, 1375.3
1 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VI:148
2 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VI:147 (f)
3 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VI:147-8
Further sources/citations:
Ancestral Roots of Certain American Colonists, 7th Edition, by Frederick Lewis Weis, additions by Walter Lee Shippard Jr. @ 30-30, The Magna Charta Sureties 1215, Frederick Lewis Weis, additions by Walter Lee Sheppard Jr, 5th Edition, 1999 @ 50-5
2 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VI:147 (f)
3 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VI:147-8
Further sources/citations:
Ancestral Roots of Certain American Colonists, 7th Edition, by Frederick Lewis Weis, additions by Walter Lee Shippard Jr. @ 30-30, The Magna Charta Sureties 1215, Frederick Lewis Weis, additions by Walter Lee Sheppard Jr, 5th Edition, 1999 @ 50-5