Career
He was styled Viscount Hinchingbrooke from 1790 to 1814. Lady Harriet Mary Montagu (14 May 1805 – 4 May 1857), married William Bingham Baring, 2nd Baron Ashburton
Lady Catherine Caroline Montagu (7 October 1808 – 30 April 1834), married Count Alexandre Joseph Colonna-Walewski, an illegitimate son of Napoleon I and Marie, Countess Walewski
John William Montagu, 7th Earl of Sandwich (8 November 1811 – 3 March 1884), married firstly Lady Mary Paget. Married secondly Lady Blanche Egerton.
