Sir | Sir Walter Scott | baronet | Baronet | Sir Arthur Conan Doyle | Oswald Mosley | 4th United States Congress | Sir Robert Peel | Lee Harvey Oswald | 4th | Oswald the Lucky Rabbit | Sir Arthur Harris, 1st Baronet | Richard Oswald | Sir Raylton Dixon | Sir Harold Hillier Gardens | Sir Fitzroy Maclean, 1st Baronet | John Montagu, 4th Earl of Sandwich | California's 4th State Assembly district | Sir Francis Baring, 1st Baronet | Oswald Spengler | Max Mosley | Thomas Howard, 4th Duke of Norfolk | Sir William Temple, 1st Baronet | Shane Mosley | Charles Lennox, 4th Duke of Richmond | Benedict Calvert, 4th Baron Baltimore | Windham Wyndham-Quin, 4th Earl of Dunraven and Mount-Earl | Sir Richard Fanshawe, 1st Baronet | Oswald Wynd | George Hamilton-Gordon, 4th Earl of Aberdeen |
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 1993, he appeared in Remains of the Day as Sir Geoffrey Wren, a character based on the 1930s British fascist Sir Oswald Mosley.
Mosley was born in Staffordshire in 1848 the eldest son of Sir Tonman Mosley, 3rd Baronet, of Ancoats (9 July 1813 – 28 April 1890), who succeeded to the title of 3rd Baronet Mosley, of Ancoats, on 24 May 1871, and wife Catherine Wood (died 22 April 1891), daughter of The Reverend John Wood of Swanwick, Derbyshire.
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Mosley was nicknamed "Baronet John Bull" due to his resemblance to John Bull, the national personification of Great Britain.