Question: Who is the paternal grandfather of Isabel Neville, Duchess Of Clarence?
Sentence (from "Richard Neville, 16th Earl of Warwick"): The eldest son of Richard Neville, 5th Earl of Salisbury, he became Earl of Warwick through marriage, and was the wealthiest and most powerful English peer of his age, with political connections that went beyond the country's borders.
Relevant evidence: Yes