This article looks at a largely neglected aspect of nineteenth- and twentieth-century religio-political activism and public doctrine, the conservative politics of premillennialist Protestantism. It approaches this subject through a case study of the doctrines and activities of the Catholic Apostolic Church, a relatively small premillennialist and Pentecostal faith-community extant from the 1830s through to the mid-twentieth century. The translation of these doctrines into Conservative party politics by Henry Drummond MP and by the seventh and eighth dukes of Northumberland is given especial attention.