Her son, Auguste Charles Joseph (1785–1870), served with distinction in Napoleon’s wars, and resided outside France from 1815 to 1830. Returning after the Revolution he held various high diplomatic posts, and was Ambassador to England from 1860 to 1862. He married, in 1817, Baroness Keith and Nairn, and one of his daughters married the fourth Marquess of Lansdowne. [193] René Louis, Marquis de Girardin (1735–1808), who distinguished himself in the Seven Years’ War, and afterwards settled at Ermenonville. There he gave an asylum to Rousseau, who died in his house. He was fortunate in saving his life in the Terror, and left France to return after the troubles were over. [194] Jean Antoine Gallois (1761–1828), the friend of Cabanis. He was made President of the Tribunate in 1802. He took but little part in politics after 1814. [195] André Morellet (1727–1819), French writer. Made a Senator in 1808. [196] Louis Mathieu, Comte de Molé (1781–1855), who was imprisoned with his father in 1794, but escaped death owing to his youth, and came to England. He held various offices under Napoleon, and was continued in his employment by Louis XVIII. He continued to take a leading part in politics until 1851, and held several important posts. [197] Giuseppe Acerbi (1773–1846), an Italian naturalist. His book was first published in English. He was Austrian Consul-General in Egypt, 1826–36. [198] Louis, Comte de Narbonne (1755–1813). He was son of one of Princess Elizabeth’s ladies, possibly by Louis XV. At any rate he was educated at the Court, and given a position in Madame Adélaïde’s suite. He escorted the Princesses to Rome in 1791. After his return he was made War Minister by Madame de Staël’s influence, but only held the post three months. He fled abroad soon after, and did not return till after 18 Brumaire. He offered his services to Napoleon, and was variously employed by him until his death of typhus at Torgau. [199] Octave Gabriel, Comte de Ségur (1778–1818), son of Louis Philippe, Comte de Ségur, and Antoinette d’Aguesseau. He married his first cousin, daughter of Henri Cardin d’Aguesseau. He showed great literary promise, but drowned himself in the Seine in 1818. His brother, Philippe Paul (1780–1873), gained much distinction by his military services, and became a recognised writer on military history. [200] Arnail François, Marquis de Jaucourt (1757–1852), born of a Protestant family. He escaped death during the Terror and left France in 1793. After his return in 1800 he became a Tribune and a Senator, and later held several offices under Louis XVIII. [201] Giambattista Casti (1721–1803). Born at Montefiasconi, he entered the Church, but gave up a canonry at his native town to travel. He is best known by his poems, and became Poet Laureate of Austria after the death of Metastasio.