MOSTYN, Sir Roger, 3rd Bt. (1673-1739), of Mostyn, Flints.

Published in The History of Parliament: the House of Commons 1715-1754, ed. R. Sedgwick, 1970
Available from Boydell and Brewer



1701 - 1702
1702 - 1705
1705 - 1708
1708 - 1713
1713 - 1715
1715 - 1734

Family and Education

b. 31 July 1673, 1st s. of Sir Thomas Mostyn, 2nd Bt., M.P., by Bridget, da. and h. of Darcy Savage of Leighton, Cheshire. educ. Jesus, Oxf. 1690. m. 20 July 1703, Lady Essex Finch, da. of Daniel Finch, M.P., 7th Earl of Winchilsea and 2nd Earl of Nottingham, 6s. 6da. suc. fa. 1700.

Offices Held

Constable, Flint castle 1702-5; paymaster of marines 1711; teller of the Exchequer Dec. 1714-June 1716; ld. lt. Flints. 1727-d.


A leader of the Flintshire Tories and a supporter of the Hanoverian succession, Mostyn followed his father-in-law, Lord Nottingham. Made a teller of the Exchequer when Nottingham joined the Whig Government on George I’s accession, he was dismissed with Nottingham in 1716, thereafter consistently voting against the Government, till he retired from Parliament in 1734.

He died 8 May 1739.

Ref Volumes: 1715-1754

Author: Peter D.G. Thomas