High Quality Content by WIKIPEDIA articles! Henry George Percy, 7th Duke of Northumberland KG, PC, FRS (29 May 1846 – 14 May 1918), styled Lord Lovaine between 1865 and 1867 and Earl Percy between 1867 and 1899, was a British Conservative politician. He served as Treasurer of the Household under Benjamin Disraeli between 1874 and 1875 and was Chairman of the National Union of Conservative and Constitutional Associations from 1879 to 1883.