William de la Pole died 1366, his wife Katherine died
1381.
Charles Frost in his article on the family thought
the de la Pole brothers (Richard and William) were
the sons of William and Elena, who subsequently
remarried John Rottenherring. However A.S. Harvey
"The de la Pole Family of Kingston-upon-Hull" published
Hull, 1957 proved neither parent correct.
William and Katherine had three daughters, Katherine,
Blanche and Margaret. All three were still unmarried
in 1339, when the king promised to provide them with
suitable husbands. By May 1340 Katherine had married
Constantine, the son of Adam de Clifton. The second
daughter, Blanche, married Richard lord Scrope of
Bolton. Margaret, the third daughter, married Robert
Neville of Hornby. This marriage probably took place
around 1362. Dr. Horrox stated "Robert's father,
Robert senior, was then heavily in debt to William,
and had been imprisoned in the Fleet for non-payment of
two thousand pounds. Michael de la Pole obtained his
release in May claiming that the money had been repaid.
This seems unlikely; three days later Robert senior took out
another bond promising repayment of the two thousand
pounds."
William de la Pole, the elder son, was, like his father, a merchant at Kingston-upon-Hul, and mayor of that burough. In the 10th King Edward III [1337], this William contracted to furnish the army in Scotland with wine, salt, and other provisions, but losing part of the cargo in the transmission to Berwick-upon-Tweed, he had an allowance for the same in passing his accounts. In three years afterwards, being a person of great opulence, he was enabled to advance the sum of £1,000 in gold to the king, who then lay at Antwerp, for which imortant service, Edward being much in want at the time of suppolies, he was constituted 2nd baron of the exchequer, and advanced to the degree of banneret with a grant out of the customs at Hull for the better support of that rank. He was afterwards known as Sir William de la Pole, senior. He m. Catherine, dau. of Sir Walter Norwich, and duing in the 40th Edward III [1367], possessed of extensive estates in the co. of York, had issue, Michae, Thomas, Edmond, Katherine, Blanche, and Margaret. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 440, Pole, Barons de la Pole, Earls of Suffolk, &c.]