Dunk lived at Tongs in Hawkhurst, Kent, England and was from a family of 'great clothiers'. In his will he endowed for Hawkhurst six almshouses, a school for twenty boys, and a house for a school master.
In 1704 Thomas married Cornelia née Palmer (1668–1717), the daughter of Ralph Palmer and Alice née White and sister-in-law to John Verney, 1st Viscount Fermanagh. There were no surviving children from the marriage.
In his will Thomas named William Richards (1690–1733), presumed to be an illegitimate son, as his executor; he left William his estate in Chieveley, Berkshire, on condition that William and his heirs took the name and arms of Dunk.
William's daughter Anne née Richards (1726–1753) - by his wife Ann née Davis (1704–1727), eldest daughter of John and Elizabeth Davis of Hawkhurst, Kent - married, in 1741, George Montagu, 2nd Earl of Halifax who took the name Dunk and became George Montagu-Dunk, 2nd Earl of Halifax.
- Speck, W. A. "Dunk, George Montagu". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/8266. (Subscription or UK public library membership required.)
- Edward Hasted (1798). "Parishes: Hawkhurst". The History and Topographical Survey of the County of Kent: Volume 7. Institute of Historical Research. Retrieved 1 March 2013.
- Plaque #1472 on Open Plaques.
- The Montague Millennium website
- Photo of plaque on Dunk's Alms Houses
- Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900. .
- List of Mayors and Sheriffs of London
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