Question: What is the date of birth of John Bourchier, 1St Baron Berners's mother?
Sentence (from "John Bourchier, 1st Baron Berners"): His daughter Joan Bourchier married Sir Henry Neville (d. 26 July 1469), son of George Neville, 1st Baron Latimer and Elizabeth Beauchamp, and had issue which included Richard Neville, 2nd Baron Latimer, father of John Nevill, 3rd Baron Latimer.
Relevant evidence: No