MOSTYN, Sir Thomas, 4th Bt. (1704-58), of Mostyn, Flints.

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



1734 - 1741
1747 - 24 Mar. 1758

Family and Education

b. 26 Apr. 1704, 1st surv. s. of Sir Roger Mostyn, 3rd Bt., M.P., and bro. of John and Savage Mostyn.  educ. Westminster 1716; Ch. Ch. Oxf. 1720.  m. 1735, Sarah, da. and coh. of Robert Western of London, 4s. 5da.  suc. fa. 8 May 1739.

Offices Held


The Mostyns were the most influential family in Flintshire, and Sir Thomas and his son represented the county for nearly fifty years without a contest. In 1754 their estate was said to be worth between £2,000 and £3,000 per annum.1 Mostyn was a Tory; but his interest was less in politics than in literature, and he made no attempt to check the Whig leanings of his son and heir.  He died 24 Mar. 1758.

Ref Volumes: 1754-1790

Author: Peter D.G. Thomas


  • 1. Thos. to Sam. Hill, 17 Aug. 1754, Attingham mss, Salop RO.