He married Lady Catherine Caroline Montagu (1808–1833), daughter of George Montagu, 6th Earl of Sandwich, and Lady Louisa Mary Anne Julia Harriet Lowry-Corry, on 1 December 1831.
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Dover House was designed by James Paine for Sir Matthew Fetherstonhaugh, Bart., MP, in the 1750s and remodelled by Henry Flitcroft, as "Montagu House", for George Montagu, created 1st Duke of Montagu, who had removed from Bloomsbury.
The Halifax River in Central Florida, United States, is named after him.
Olivia Acheson (d. 12 February 1863), daughter of the 1st Earl of Gosford, on 8 October 1822 at London.
One of Consuelo Iznaga's closest friends, Edith Wharton, was said to have incorporated certain aspects of her friend's marriage in her unfinished novel, The Buccaneers.
George Montagu Dunk, the 2nd Earl of Halifax, Ranger of Bushy Park and Chief Steward of the Honor and Manor of Hampton Court built the house in 1757.
He died "heavily in debt", and left his Durham estates to his nephew Richard Lumley-Saunderson, 4th Earl of Scarbrough and his Sussex estates to his nephew George Montagu-Dunk, 2nd Earl of Halifax.
The map so impressed George Montagu-Dunk, 2nd Earl of Halifax, appointed president of the Board of Trade and Plantations in 1748, that Halifax opened up the official archives and solicited new maps from the colonies for Mitchell to make a new and better map.
In 1770, the then-Lord of the Manor Earl of Halifax added a spire to the tower.