Robert Stewart, 1st Marquess of Londonderry
Robert Stewart, 1st Marquess of Londonderry PC, was a County Down landowner, Irish Volunteer, and member of the parliament who, exceptionally for an Ulster Scot and Presbyterian, rose within the ranks of Ireland's "Anglican Ascendancy." Wikipedia
Born: September 27, 1739, National Trust - Mount Stewart, United Kingdom
Died: April 6, 1821 (age 81 years), National Trust - Mount Stewart, United Kingdom
Parents: Alexander Stewart
Grandparents: William Stewart and Frances Stewart
Children: Charles Stewart, Robert Stewart, Viscount Castlereagh, Frances Stewart, and more
Spouse: Frances Pratt (m. 1775) and Lady Sarah Frances Seymour (m. 1766–1770)