(Robert Stewart) 2d Marquis of Londonderry 1769-1822; Brit. statesman, born in Ireland
, Viscount. Title of Robert Stewart, Second Marquis of Londonderry. 1769–1822.
British politician who as chief secretary for Ireland (1798–1801) was able to quell the 1798 rebellion and form a political union between Ireland and Great Britain (1800).