Hugh De Keynes
Hugh De was born before 1166.  He died after May 29th, 1217.

 Amabel De Bereville
Amabel De was born in Milton Keynes, Buckinghamshire, England.  She died before July 28th, 1221 in Milton Keynes, Buckinghamshire, England.

 Lucas De Keynes
Lucas De was born in Milton Keynes, Buckinghamshire, England.