On 29 April 1693 he succeeded his father as Baron Cornwallis.
Between 1695 and 1698, he sat as Member of Parliament for Eye, as a Whig.
The last two years of his life, from 1721 to January 1721/22 he held the office of Paymaster of the Forces in the Cabinet of Walpole and Townshend.
[1] A grandson of Charles Cornwallis, 2nd Baron Cornwallis, he married Lady Charlotte Butler, daughter of Richard Butler, 1st Earl of Arran, on 6 June 1699.
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