Francis Ingram Seymour Conway (1743-1822) succeeded his father to become the 2nd Marquess of Hertford in 1794. He was Lord of the Treasury (1774-1782); Ambassador to Berlin and Vienna (1793-1794) and Lord Chamberlain (1812-1821). In 1776 he married the Hon. Isabella Anne Ingram, daughter of Charles Ingram, 9th Viscount of Irvine and Frances Shepherd, they had one son Francis. On his mother-in-law's death in 1807 he and his wife added Ingram to their surname due to the fortune they had inherited from her. The 2nd Marchioness was a close friend of the future George IV and the 2nd Marquess' appointment as Lord Chamberlain is thought to have been influenced by that. In 1797 the 2nd Marquess acquired the leasehold of Manchester House (now called Hertford House). The following works of art can be found in The Wallace Collection which were acquired by or given to the 2nd Marquess: Sir Joshua Reynolds' 'Miss Nelly O'Brien', Romney's 'Mrs Mary Robinson Perdita', Gainsborough's 'Mrs Robinson', and a few pieces of French furniture and Sèvres porcelain.
These papers include the marriage settlement of the 2nd Marquess and 2nd Marchioness, originals and copies of both of their wills as well as an account of sale of the 2nd Marchioness' Stocks.