Anne Hamilton of Killyleagh who married Dr Charles-Ross Fleming, in 1743. He claimed the title after the death of the 6th earl of Wigton in 1747, but it was never substantiated. http://www.armigerousdescents.com accessed 01/08/16; The Peerage of Scotland, Including the Dormant, Attainted and Extinct Titles (Edinburgh 1834) p.100 .