Question: Who is Humphrey, 2Nd Earl Of Buckingham's maternal grandfather?
Sentence (from "Eleanor de Bohun"): Lady Eleanor de Bohun (– 3 October 1399) was the elder daughter and co-heiress with her sister, Mary de Bohun, of their father Humphrey de Bohun, 7th Earl of Hereford (1341–1373).
Relevant evidence: Yes