Mortimer, Richard, Family of Rannulf de Glanville, Bulletin of the Institute of Historical Research, vol 54 no 129 (May 1981). pp1-16. Rutgers Alexander Library (periodical, shelved as London University Institute of Historical Research). Available (for purchase) at https://onlinelibrary.wiley.com/doi/full/10.1111/j.1468-2281.1981.tb02034.x. Information from this source tagged as [Ref: Mortimer GLANVILLE p[0-9]*].
Sources for birth and parent Information
father:
[Ref: Mortimer GLANVILLE p6]
Research Notes:
once called William, and twice called Rannulf [Ref: Mortimer GLANVILLE p6]
appears a number of times after 1198 [Ref: Mortimer GLANVILLE p6]