Question: What is the date of death of Isabel Neville, Duchess Of Clarence's father?
Sentence (from "Isabel Neville, Duchess of Clarence"): Lady Isabel Neville (5 September 1451 – 22 December 1476) was the elder daughter and co-heiress of Richard Neville, 16th Earl of Warwick (the "Kingmaker" of the Wars of the Roses), and Anne de Beauchamp, suo jure
Relevant evidence: Yes