It is accordingly very doubtful whether the _coup de grâce_ was dealt by Lord Mohun or by his second. With Lord Mohun, the barony of Mohun of Okehampton became extinct; but the estate of Gawsworth, in Cheshire, which he had inherited from Lord Macclesfield, was vested by his will in his widow, and eventually passed to her second daughter by her first husband, Anne Griffith, wife of the Right Honourable William Stanhope, from whom it passed to the Earls of Harrington.
Boconnoc and the Devon and Cornish estates were sold in 1717 for £54,000 to Thomas Pitt, commonly called Governor Pitt.
[18] The earl died on November 5th, 1701.
[19] _History of the Reign of Queen Anne_, Vol. XII, pp. 305-6 (1713).
Thomas Pitt was the son of a tradesman at Brentford, and he went to push his fortunes in India as a merchant adventurer. There he obtained a diamond, thought to be the finest known, and with it returned to England, where he offered it for sale to Queen Anne, and ultimately sold it to the Regent Duke of Orleans, for the French nation, for £135,000.
The Regent and his two successors in the government of France set this diamond as an ornament in their hats on occasions of state. It was stolen during the disturbances of the Revolution, but was recovered, and Napoleon had it placed between the teeth of a crocodile, forming the handle of his sword.
With about half the large sum obtained by the sale of the gem, Pitt purchased the property of the last Lord Mohun in Cornwall, and settled at Boconnoc. He also bought burgess tenures, giving the right of franchise at Old Sarum, and represented that place in Parliament. He had two sons, Robert and Thomas, and Robert succeeded his father at Boconnoc. He married Harriet Villiers, third sister of John, Earl Grandison, and died in May, 1727, leaving two sons, Thomas Pitt, and William, who was afterwards created Earl of Chatham. Thomas Pitt, his brother, was created Earl of Londonderry, in consequence of his marrying the heiress of Ridgeway, in which family was the earldom.
Thomas Pitt, the eldest son of Robert, engaged in political intrigue, and supported the party of Frederick, Prince of Wales. He married Christiana, sister of George, first Lord Lyttleton, by whom he had one son, Thomas, who was created Baron Camelford in 1784, when his first cousin William Pitt rose to be Prime Minister. Thomas Pitt was aged twenty-five when he became Baron Camelford, and he died in January, 1793, leaving a son, Thomas Pitt, the second and last Lord Camelford, and a daughter, married to William Wyndham, Lord Grenville. Thomas Pitt, son of the first baron, became an object of attention in Cornwall almost from his birth.