married 7 October 1796 to John Henry Upton, 1st Viscount Templetown, son of the Clerk Comptroller to the Dowager Princess of Wales, Clotworthy Upton, 1st Baron Templetown Henry Upton, 2nd Viscount Templetown George Upton, 3rd Viscount Templetown, married Susan Woodford, daughter of Field Marshal Sir Alexander Woodford Hon. Edward Upton, married Susan Maddy, daughter of Rev. John Maddy, parents of Henry Upton, 4th Viscount Templetown Hon. Mary Upton, married John Spalding General Hon. Arthur Upton, married Hon. Elizabeth Blake, daughter of Joseph Blake, 3rd Baron Wallscourt Lady Henrietta Susannah Montagu, born 9 August 1777, died 19 November 1825, married 3 May 1798 to Lt. Col Sir William James of Dorset, son of Lt. Col Sir Charles Hamilton James (son of Charles Hamilton (styled Comte d'Arran in France), illegitimate son of James Hamilton, 4th Duke of Hamilton and his mistress, Lady Barbara FitzRoy) by his wife, Catherine Napier, daughter of Sir Gerrard Napier, 5th Bt. Maria James, born 1818, died 17 August 1899, married David Erskine, 13th Earl of Buchan on 17 July 1876 Lord Sandwich also had two illegitimate children, a daughter called Harriet Montagu, who married James Grant, son of Sir Ludovic Grant of Dalvey, 6th Bt. and William Augustus Montagu who rose to the rank of Vice-Admiral in the Royal Navy. Ancestry Gallery References 1744 births 1814 deaths British MPs 1761–1768 British MPs 1768–1774 British MPs 1774–1780 British MPs 1780–1784 British MPs 1784–1790 British MPs 1790–1796 Hinchingbrooke, John Montagu, Viscount Members of the Privy Council of Great Britain John Montagu, 05th Earl of Sandwich People educated at Eton College Scots Guards officers Hinchingbrooke, John Montagu, Viscount United Kingdom Postmasters General Masters of the Buckhounds Earls of Sandwich