Question: Who is Priscilla Bertie, 21St Baroness Willoughby De Eresby's maternal grandfather?
Sentence (from "Robert Welles, 8th Baron Willoughby de Eresby"): He was the prime mover in an uprising against Edward IV in 1470, although his actions were possibly orchestrated by Richard Neville, 16th Earl of Warwick.
Relevant evidence: No