Question: Who is Maud Fitzjohn, Countess Of Warwick's paternal grandfather?
Sentence (from "John Fitzgeoffrey"): John Fitz Geoffrey was the son of Geoffrey Fitz Peter, 1st Earl of Essex and Aveline de Clare, daughter of Roger de Clare, 2nd Earl of Hertford and his wife Maud de Saint-Hilaire.
Relevant evidence: Yes