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:
first son, age 18 in 1185 [Ref: Keats-Rohan DD p334],
parents:
[Ref: Keats-Rohan DD p334]
Research Notes:
1185: at death of father, he had been a royal ward in the custody of
William de Jarponville for five years [Ref: Keats-Rohan DD p334]