High Quality Content by WIKIPEDIA articles! Charles Stewart Vane-Tempest-Stewart, 6th Marquess of Londonderry KG, GCVO, PC, DL, JP (16 July 1852 – 8 February 1915), styled Viscount Castlereagh between 1872 and 1884, was an Anglo-Irish Conservative politician, landowner and benefactor, who served in various capacities in the Conservative administrations of the late 19th and early 20th centuries. After succeeding his father in the marquessate in 1884, he was Lord-Lieutenant of Ireland between 1886 and 1889. He later held office as Postmaster General between 1900 and 1902 and President of the Board of Education between 1902 and 1905. A supporter of the protestant causes in Ulster, he was an opponent of Irish Home Rule and one of the instigators of the formal alliance between the Conservative Party and the Liberal Unionists in 1893. Staunchly Conservative, he also voted against the Parliament Act of 1911.