Question: Who is William De Beaumont, 3Rd Earl Of Warwick's paternal grandfather?
Sentence (from "Waleran de Beaumont, 4th Earl of Warwick"): After the death of his brother, William de Beaumont, 3rd Earl of Warwick, an impostor arose, claiming to be the deceased Earl; he gave Waleran a great deal of trouble in maintaining his claim.
Relevant evidence: No