English Baronies: A Study of the Origin & Descent 1086-1327 @ p 111, younger brother of Hugh de Dover, Lord of Chilham
The cited information was published by Oxford, Oxford, 1963 (Ref: p 111, younger brother of Hugh de Dover, Lord of Chilham) The author/originator was I.J. Sanders.
Source Notes
Quoted as a reference & source by Weiss in "Magna Charta
Sureties, 1215"