James Grenville was originally brought into Parliament by Thomas Pitt, subsequently resigning his seat to succeed his brother Thomas at Bridport. Like his elder brothers, a member of the political group led by his uncle, Lord Cobham, he at first acted with the Opposition, voting against the Hanoverians in 1742 and 1746, and signing the opposition whip of 10 Nov. 1743. When Cobham opened negotiations with the Pelhams in January 1746, one of his stipulations was that James should be provided with an employment of £1,000 a year, which was provided in the form of a seat on the board of Trade a month later.
He died 14 Sept. 1783.
