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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.
The Napier Baronetcy, of Merrion Square in the County of Dublin, was created in the Baronetage of the United Kingdom on 9 April 1867 for the Conservative politician and former Lord Chancellor of Ireland Joseph Napier.
Sir Joseph William Lennox Napier, 4th Baronet of Merrion Square, (1 August 1895 – 13 October 1986), was a British baronet and soldier in both World War I including the Gallipoli Campaign and World War II.
He succeeded to the Baronetage of Merrion Square in 1884 on the death of Sir Joseph Napier, 2nd Baronet (1841–1884), and was succeeded by Sir Joseph William Lennox Napier, 4th Baronet (1895–1986).