Lewis, whose father had represented Westbury in nine Parliaments, came of an old Welsh family with large estates in Glamorgan. A member of the October Club under Queen Anne, he was returned as a Tory for Southampton in 1715, voting against the Administration in all recorded divisions of that Parliament. His name was sent to the Pretender in 1721 as a probable supporter in the event of a rising.
I forgot to mention to-day ... whether you remembered to speak to Mr. Lewis about Portsmouth in case he is not like to be chose at Sarum.
G. T. Clark, Genealogies of Morgan and Glamorgan, 42-44, 52-53; HMC Portland, vii. 425, 428; HMC Egmont Diary, i. 126, 315; ii. 78; iii. 337; CJ, xxii. 308; Wager to Walpole, 14 June 1733, Cholmondeley (Houghton) mss.
His last recorded speech was against a place bill in April 1735.
Lewis died 22 Nov. 1736. In his will he left his estates, which were heavily encumbered, to his only grandchild, the 4th Earl of Plymouth, then ‘a sickly minor of about 4 years old’, with remainder successively to Sir Robert and Horace Walpole, and their issue, both of whom received substantial legacies and were appointed executors.
