Henry Charles Keith Petty-Fitzmaurice, 5th Marquess of Lansdowne, KG, GCSI, GCMG, GCIE, PC (14 January 1845 – 3 June 1927), was a British statesman who served successively as Governor General of Canada, Viceroy of India, Secretary of State for War and Secretary of State for Foreign Affairs.
In 1917, during the First World War, he wrote the "Lansdowne letter", advocating in vain a compromise peace. A millionaire, he had the distinction of having held senior positions in Liberal and Conservative Party governments.[1]