At George I’s accession the predominant interest in Denbighshire was that of the Myddeltons of Chirk Castle, Tories, whose head, Sir Richard Myddelton, represented the county from 1685 till his death in 1716. At the ensuing by-election the seat was wrested from them by Watkin Williams, later Williams Wynn, a Jacobite, who was again successful after a contest in 1722, and unopposed in 1727. Before the general election of 1734 the Myddeltons concluded an agreement with Wynn, under which they promised to support him for the county, in return for his supporting them in Denbigh Boroughs.
Early in 1739 John Myddelton, the then head of his family, obtained a promise from Walpole of government support for himself against Wynn at the forthcoming general election.
Wynn retained the seat unopposed till his death in 1749, on which Pelham urged John Myddelton’s son Richard, ‘to push for the county’.
Number of voters: 1,500-2,300
