Sir | Sir Walter Scott | 3rd Rock from the Sun | baronet | Baronet | Edmund Burke | Edmund Spenser | Sir Arthur Conan Doyle | Edmund Hillary | Edmund Wilson | South Carolina's 3rd congressional district | Robert Gascoyne-Cecil, 3rd Marquess of Salisbury | Sir Robert Peel | Michigan's 3rd congressional district | Thomas Fairfax, 3rd Lord Fairfax of Cameron | Edmund Husserl | 3rd United States Congress | Fernando Álvarez de Toledo, 3rd Duke of Alba | 3rd arrondissement of Marseille | Sir Arthur Harris, 1st Baronet | Edmund Muskie | Edmund Allenby, 1st Viscount Allenby | Sir Raylton Dixon | Sir Harold Hillier Gardens | Sir Fitzroy Maclean, 1st Baronet | Edmund Barton | Sir Francis Baring, 1st Baronet | Edmund the Martyr | Edmund Rubbra | Edmund Kirby Smith |
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.
Shortly after Monson moved to Athens, the United States and Danish governments asked him to resolve a dispute known as the Butterfield Claims that had been running since 1854 and 1855, when two ships belonging to Carlos Butterfield & Co., thought to be carrying war materials to Venezuela, were detained at St Thomas, then a Danish colony.
He entered the British diplomatic service in 1906 and served in junior capacities in Constantinople, Tokyo, Paris and Tehran.