Will Johnson found the following excellent item in the The East Sussex record office:

East Sussex Record Office: Archive of the Gage family of Firle [SAS/G21/1 -
SAS/G46/14]
Archive of Gage family of Firle
Catalogue Ref. SAS/G
Creator(s): Gage family of East Sussex, Viscounts Gage

FAMILY SETTLEMENTS
FILE - Counterpart settlement - ref. SAS/G21/5 - date: 15 Dec 1527
[from Scope and Content] John Gage, kt, vice-chamberlain of the king, and Christopher Baynham, kt and his son and heir George Baynham, esq; GB to marry JG's daughter Cecile
_________________________________________________________________________