GRANVILLE LEVESON-GOWER, 1ST EARL GRANVILLE

'Granville Leveson-Gower, 1st Earl Granville' (12 October, 1773–8 January, 1846) was a British Liberal statesman and diplomat.
He was a son of Granville Leveson-Gower, 1st Marquess of Stafford and his third wife Lady Susannah Stewart, daughter of Alexander Stewart, 6th Earl of Galloway). He was also a younger, paternal half-brother of George Leveson-Gower, 1st Duke of Sutherland.
He served as British ambassador to Russia (1804-1807) and France (1824-1828, 1830-1835, 1835-1841).
He married Lady Harriet Cavendish (1785-1862), daughter of William Cavendish, 5th Duke of Devonshire and Lady Georgiana Spencer. The Earl and Countess Granville threw events that were often the toast of Parisian society while he was a British diplomat.
Lord Granville, prior to marrying Lady Harriet Cavendish, was the lover of Lady Harriet's maternal aunt, Henrietta-Frances Ponsonby, Countess of Bessborough, nee Lady Henrietta-Frances Spencer, with whom he fathered two illegitimate children: Harriette Stewart and George Stewart.
He was created Viscount Granville in 1815 and Earl Granville in 1833.