"... in his father's Inquisitions Post Mortem, he was said to be age 22 weeks and more on 14 March 1418 and 34 weeks on 9 June 1418, pointing to a birth date around the middle of October 1417." (citing several sources)
His own ipm gives his "death date as 27 November 1482." (citing Lincolnshire Pedigrees, Vol. III).
