Lord Cornwallis married the Honourable Elizabeth, daughter of
Charles Townshend, 2nd Viscount Townshend, in 1722. They had seven children: • Lady Mary Cornwallis (6 June 1736 – 28 December 1770), married on 13 August 1769
Samuel Whitbread and had issue. • Gen.
Charles Cornwallis, 1st Marquess Cornwallis • Capt. Hon. Henry Cornwallis (10 September 1740 – 1761) • Bishop
James Cornwallis, 4th Earl Cornwallis • Adm. Sir
William Cornwallis,
RN (1744–1819) • Lady Elizabeth Cornwallis (d. 20 March 1796), married
Bowen Southwell in July 1753 • Lady Charlotte Cornwallis (d. 11 March 1794), married 8 April 1756 Bishop
Spencer Madan and had issue. He died in June 1762, aged 62, and was succeeded by his eldest son, Charles, who became a prominent military commander and was created Marquess Cornwallis in 1792. The Countess Cornwallis died on 17 December 1785. He was the grandson of
Charles Cornwallis, 3rd Baron Cornwallis; the great-grandson of
Charles Cornwallis, 2nd Baron Cornwallis; and the great-great-grandson of
Frederick Cornwallis, 1st Baron Cornwallis. He was the grandfather of
Charles Cornwallis; the great-grandfather of
James Mann; the 2nd great-grandfather of
Fiennes Cornwallis; the 3rd great-grandfather of
Fiennes Cornwallis, 1st Baron Cornwallis; the 4th great-grandfather of
Wykeham Cornwallis, 2nd Baron Cornwallis; and the 5th great-grandfather of
Fiennes Cornwallis, 3rd Baron Cornwallis. ==Ancestry==