Sir William Morice, 3rd Baronet (1707–1750), Member of Parliament for Newport 1727–1734, and for Launceston 1734–1750
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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.
Sir William Morice, 1st Baronet (1628–1690), his eldest son, Member of Parliament for Newport 1689–1690