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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.
Lowther was in Hamburg on a textile venture in 1637, the year that his father died.
He spent the remainder of his life dwelling with his father-in-law or in his house on Brook Street, Holborn.