Robert Stewart, 1st Marquess of Londonderry Irish politician, born 1739 (1739–1821) Parents Mary Cowan Alexander Stewart Children Charles Vane, 3rd Marquess of Londonderry Lady Caroline Stewart Lady Selina Stewart Lady Selina Stewart Lady Matilda Stewart Frances Stewart Lady Georgiana Stewart Octavia Stewart Robert Stewart, Viscount Castlereagh Lady Emily Stewart Siblings Alexander Stewart Partners Frances Stewart Sarah Seymour
