Dear Newsgroup ~
Complete Peerage 2 (1912): 388–389 (sub Buckingham) includes a somewhat brief account of Sir Humphrey Stafford, K.G., Duke of Buckingham, who was slain at the Battle of Northampton 10 July 1460. The following information is provided regarding his death and place of burial:
"He died as above, 10 July 1460, and was buried in the Grey Friars at Northampton." END OF QUOTE.
Trans. of Essex Arch. Society n.s. 7 (1900): 25–28 gives the following correction as to his place of burial:
"On July 10th, 1460, he was killed in the battle of Northampton, whilst fighting close to the royal tent. Dugdale [Baronage, vol. i, p. 166] believed that the Duke's remains were buried in the church of the Greyfriars at Northampton, but such interment (if it took place) was probably only temporary, for he was certainly interred ultimately with his wife at Pleshey [Essex], in a chapel which he built and endowed." END OF QUOTE
The above article can be found at the following weblink:
http://esah1852.org.uk/images/pdf/new-series/T2070000.pdf
Complete Peerage makes no mention that Duke Humphrey left a will, but an abstract of his PCC will can be found at Nicolas, Testamenta Vetusta 1 (1826): 295–297, at the following weblink:
https://books.google.com/books?id=IybOaH69SgwC&pg=PA295
The will is dated 16 August 1460 [sic], and proved 2 December 1460 (P.C.C. 21 Stokton). Dugdale justly observes, that this date [of Duke Humphrey's will] must be erroneous, because the Duke was killed in July 1460.
The following is a list of the 17th Century New World immigrants that descend from Sir Humphrey Stafford, Duke of Buckingham, and his wife, Anne Neville:
St. Leger Codd, Edward Digges, Warham Horsmanden, Katherine Saint Leger, Mary Johanna Somerset, Margaret Touteville.
Douglas Richardson, Historian and Genealogist