MP for Thirsk 1765-1768, Buckingham 1770-1790 and Buckinghamshire 1790-1797. PC 1783/$/James Grenville, 1st Baron Glastonbury, PC (6 July 1742 – 26 April 1825) of Butleigh Court, Somerset was a United Kingdom politician, who was a member of both houses of Parliament during his career.