Sir John Delaval, 3rd Baronet (1654–1729), English MP for Morpeth and Northumberland
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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 1716 he purchased for £5000 the forfeited estate of the Shafto family at Bavington Hall, Northumberland, and in 1718 he bought the ancient seat of the Delaval family at Seaton Delaval from his impoverished cousin, Sir John Delaval, 3rd Baronet.