Arthur French; born 1786, eldest son of Arthur French, of French Park. Married 1818 to Mary (d. 7 September 1843), daughter of Christopher McDermott.

Member of Parliament for Roscommon, 1821-1832. Created Baron de Freyne in the Peerage of Ireland, 16 May 1839. As he had no sons, was again created Baron de Freyne, 5 April 1851, with a special remainder to allow his brothers to succeed. Lord Lieutenant for Roscommon from 1855 until his death.

Died 29 September 1856, when the barony of 1839 became extinct and that of 1851 passed to his brother John French .