1840) September 17 William Fitzwilliam Owen, British Royal Navy admiral (d. 1857) Patrick Syme, Scottish painter (d. 1845) September 19 Giuseppe Caspar Mezzofanti, Italian cardinal and hyperpolyglot (d. 1849) Coulson Wallop, English politician (d. 1807) September 21 – John Peter Grant, Scottish politician (d. 1848) September 24 Robert Gilmor Jr., shipowner and art collector (d. 1848) Michael Linning, Writer to the Signet; Scottish solicitor (d. 1838) Mariano Sánchez de Loria, Argentine politician (d. 1842) September 25 Judith Lomax, American poet and religious writer (d. 1828) Nikolaus von Maillot de la Treille, German general (d. 1834) September 26 – Johnny Appleseed, (John Chapman), American nurseryman and Swedenborgian missionary, plants apple tree nurseries in Ohio, Indiana and Illinois (d. 1845) September 27 John Griscom, American chemist (d. 1852) Bredo Henrik von Munthe af Morgenstierne Sr., Norwegian jurist (d. 1835) September 28 Sir James Colquhoun, 3rd Baronet, of Luss, politician (d. 1836) Sebastian von Schrenck, German politician (d. 1848) September 30 Charles-Étienne Chaussegros de Léry, Canadian politician (d. 1842) George Mathews, American judge (d. 1836) October October 2 – Johannes Spitler, American painter of furniture (d. 1837) October 4 Francis Ommanney, British MP (d. 1840) Henry Siddons, British actor (d. 1815) October 7 Ferdinando Orlandi, Italian composer (d. 1848) Jean Thienpont, Belgian politician and lawyer (d. 1863) October 8 Henry Duncan, British geologist, priest and social reformer (d. 1846) John Ely, American politician (d. 1849) Teis Lundegaard, Norwegian politician (d. 1856) October 10 – Peter Nourse, American clergyman (d. 1840) October 12 George J. F. Clarke, prominent citizen of East Florida (d. 1836) Karoline von Feuchtersleben, German noblewoman (d. 1842) Luis Eduardo Pérez, President of Uruguay (d. 1841) October 13 William Astell, English banker and politician (d. 1847) Samuel McKee, American politician and lawyer (d. 1826) October 15 – John Boit, one of the first Americans involved in the maritime fur trade (d. 1829) October 18 Adolf Müllner, German writer (d. 1829) Sarah Thompson, Countess Rumford, philanthropist (d. 1852) October 19 – Charles Cornwallis, 2nd Marquess Cornwallis, British noble (d. 1823) October 21 – Archibald Campbell, British Army officer (d. 1838) October 23 Adam Otto von Bistram, Baltic German military personnel in Imperial Russian service (d. 1828) René de Chazet, French writer (d. 1844) October 26 – Albert Gregorius, Belgian painter (d. 1853) October 27 – Alexander Baring, 1st Baron Ashburton, British politician (d. 1848) October 28 John Boyle, United States federal judge