John Sheffield, 1st Duke of Buckingham and Normanby, KG, PC (7 April 1648 – 24 February 1721), was a poet and notable Tory politician of the late Stuart period, who served as Lord Privy Seal and Lord President of the Council.
Lord Lieutenant of Middlesex 19 September 1711 – 28 October 1714
More information on the Wikipedia page [1]. His monument, in Westminster Abbey, is described here.