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His father, William Harcourt Isham Mackworth (1806—1872), a younger son of Sir Digby Mackworth, the 3rd Baronet, took the additional surname Dolben after he married Frances, the heiress of Sir John English Dolben, the 4th Baronet.
In 1717 he became Commissioner of the Alienation Office, and in 1720 was appointed joint Vice-Treasurer, Receiver General and Paymaster of Ireland, offices he held until his death.