Keats-Rohan, K.S.B., Domesday Descendants, A Prosopography of Persons Occurring in English Documents 1066-1166. Vol II: Pipe Rolls to Cartae Baronum. Bury St Edmunds, Suffolk: Boydell Press, 2002. NYPL ARF 03-4178 vol 2. Corrections at http://users.ox.ac.uk/~prosop/domesday-descendants-corrigenda.pdf Information from this source tagged as [Ref: Keats-Rohan DD p[0-9]*].
Sources for birth and parent Information
date:
second son [Ref: Keats-Rohan DD p569]
younger son [Ref: Keats-Rohan DD p920],
parents:
[Ref: Keats-Rohan DD p569, Keats-Rohan DD p920]
Research Notes:
abt 1172: disputed succession with his brother Henry [Ref: Keats-Rohan DD
p920]
1200/01: final concord with his brother Henry de Tilly that established
his right to part of their parents' inheritance [Ref: Keats-Rohan DD p920]