Robert Stewart, first marquess of Londonderry (1739-1821)
He was an Irish MP for County Down (1769-83), created Viscount Castlereagh in 1795, earl
of Londonderry in 1796, and Marquess of Londonderry in 1816.
He was an Irish MP for County Down (1769-83), created Viscount Castlereagh in 1795, earl
of Londonderry in 1796, and Marquess of Londonderry in 1816.