Question: Who is Margaret Of Hereford's maternal grandfather?
Sentence (from "Sibyl de Neufmarché"): Sibyl de Neufmarché, Countess of Hereford, "suo jure" Lady of Brecknock (c. 1100 – after 1143), was a Cambro-Norman noblewoman, heiress to one of the most substantial fiefs in the Welsh Marches.
Relevant evidence: No