Until 1706, the practice was generally for the senior official to lead the Southern Department, and the junior the Northern Department, with the Northern Secretary being transferred to the Southern Department when a vacancy arose at the latter.[4] During the reigns of George I and George II, however, the Northern Department began to be seen as the more important, since its responsibilities included the monarchs' ancestral home of Hanover.[5] During the reign of George III, the two departments were of approximately equal importance.[6]
^Returned as MP for Callington from 1661 to 1665; thereafter raised to the peerage of England as Baron Arlington, and created Earl of Arlington in 1672.
^Served as sole Secretary of State from June to December 1690; again from March 1692 to March 1693.
^Served as sole Secretary of State from November to March 1694.
^Acting Secretary of State for the Southern Department.
^Acting Secretary of State for the Southern Department from June to November 1700; official appointment from 5 November 1700.
^Returned as MP for Calne from 1702 to 1705; thereafter returned as MP for West Looe from 1705 to 1713.
^Returned as MP for Wendover from March 1715 to 1715; thereafter returned as MP for Cockermouth from 1715 to 1717.
^Acting Secretary of State for the Southern Department from May to December 1723; official appointment from 12 December 1716.
^In February 1746 John Carteret, 2nd Earl Granville held office for two days, however as the formalities of his appointment were not completed sources typically do not include him as a Southern Secretary.
^Sainty, J. C. (1973). "Introduction". Office-Holders in Modern Britain: Volume 2 - Officials of the Secretaries of State 1660-1782. University of London. pp. 1–21 – via British History Online. At the Restoration [in 1660] the practice of appointing two Secretaries of State, which was well established before the Civil War, was resumed. Apart from the modifications which were made necessary by the occasional existence of a third secretaryship, the organisation of the secretariat underwent no fundamental change from that time until the reforms of 1782 which resulted in the emergence of the Home and Foreign departments. ... English domestic affairs remained the responsibility of both Secretaries throughout the period. In the field of foreign affairs there was a division into a Northern and a Southern Department, each of which was the responsibility of one Secretary. The distinction between the two departments emerged only gradually. It was not until after 1689 that their names passed into general currency. Nevertheless the division of foreign business itself can, in its broad outlines, be detected in the early years of the reign of Charles II.
^Sainty, ed: J.C. (1974). Office-Holders in Modern Britain: Volume 2, Officials of the Secretaries of State 1660-1782. University of London. pp. 22–58.
^'Lists of appointments', in Office-Holders in Modern Britain: Volume 2, Officials of the Secretaries of State 1660–1782, ed. J C Sainty (London, 1973), pp. 22-58. British History Online http://www.british-history.ac.uk/office-holders/vol2/pp22-58 [accessed 18 July 2017].