Sir John Thorold, 4th Baronet (c.1664–1717), MP for Grantham and Lincolnshire
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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.