HAY, Thomas, Visct. Dupplin (1710-87).

Published in The History of Parliament: the House of Commons 1754-1790, ed. L. Namier, J. Brooke., 1964
Available from Boydell and Brewer



26 Jan. - 21 Apr. 1736
1741 - 29 July 1758

Family and Education

b. 4 June 1710, 1st s. of George, 8th Earl of Kinnoull [S], by Abigail, da. of Robert Harley, 1st Earl of Oxford.  educ. Westminster 1718; Ch. Ch. Oxf. 1726.  m. 12 June 1741, Constantia, da. and h. of John Kyrle Ernle of Whetham, Wilts., 1s. d.v.p.  suc. fa. as 9th Earl of Kinnoull 29 July 1758.

Offices Held

Commr. of revenue [1] 1741-6; ld. of Trade 1746-1754; chairman of committee of elections and privileges 1747-58; ld. of Treasury 1754-5; jt. paymaster gen. 1755-7; P.C. 27 Jan. 1758; chancellor of the duchy of Lancaster 1758-62; recorder of Cambridge 1758- d.; ambassador to Portugal 1759-62; chancellor of St. Andrews Univ. 1765- d.


Lord Dupplin was successively the faithful servant of Sir Robert Walpole, Henry Pelham, and the Duke of Newcastle. In 1754 he was returned unopposed for Cambridge, a borough managed for Government by Dupplin and Lord Montfort. He had been employed by Pelham on election business and in 1754 had to explain to Newcastle all Pelham’s plans for the forthcoming general election. After the election he drew up for Newcastle a list of the House of Commons arranged according to political allegiances. He was also an expert on finance, and in this also he was Newcastle’s mentor at the Treasury. ‘Lord Dupplin aimed at nothing but understanding business and explaining it’, wrote Horace Walpole, reviewing in 1755 the leading speakers in the House of Commons.1

But Kinnoull (as Dupplin became in 1758) was not made for Opposition and knew it. On Newcastle’s resignation he told George III he would support whatever minister the King should name. When the Duke of Devonshire was dismissed, Kinnoull resigned his office from his ‘inviolable friendship’ to Devonshire, but refused to go into opposition.2 He retired to Scotland and ceased to concern himself with politics; in July 1765, much to Newcastle’s chagrin, he refused to become Government manager for Scotland under the Rockingham Administration.

He died 27 Dec. 1787.

Ref Volumes: 1754-1790

Author: John Brooke


  • 1. Mems. Geo. II, ii. 144, 146.
  • 2. Sedgwick, 106, 162.