Sir Thomas was the son of John Dingley of Boston, Lincolnshire and his wife, Mabel, daughter of Edmund Weston. He was included in a bill of attainder passed under Henry VIII of England; another person on the same bill was Margaret Pole, Countess of Salisbury. He was accused, together with Robert Granceter, merchant, of "going to several foreign princes and persuading them to make war with the King". He had no trial, and no proof of treasonable practices was ever brought against him. He was found guilty of high treason 28 April 1539, and beheaded on Tower Hill, together with Sir Adrian Fortescue.
There is a discrepancy among the chroniclers as to the date of the execution. Stow gives 10 July, the Gray Friars' "Chronicle" and Wriothesley, 9 July.
- This article incorporates text from a publication now in the public domain: Camm, Bede (1908). "Ven. Sir Thomas Dingley". In Herbermann, Charles (ed.). Catholic Encyclopedia. 4. New York: Robert Appleton Company. endnote:
- For the story of the suppression of the Knights of St. John in England, see Stow, "Chronicle", pp. 579, 580.