William Blake | Sir | Sir Walter Scott | 3rd Rock from the Sun | baronet | Baronet | Valentine's Day | Blake's 7 | Sir Arthur Conan Doyle | Blake Lively | South Carolina's 3rd congressional district | Quentin Blake | Robert Gascoyne-Cecil, 3rd Marquess of Salisbury | Sir Robert Peel | Michigan's 3rd congressional district | Thomas Fairfax, 3rd Lord Fairfax of Cameron | 3rd United States Congress | Fernando Álvarez de Toledo, 3rd Duke of Alba | 3rd arrondissement of Marseille | Sir Arthur Harris, 1st Baronet | Blake | Sir Raylton Dixon | Sir Harold Hillier Gardens | Sir Fitzroy Maclean, 1st Baronet | Blake Edwards | Sir Francis Baring, 1st Baronet | Valentine | Stephanie Rawlings-Blake | Sir William Temple, 1st Baronet | Henry John Temple, 3rd Viscount Palmerston |
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.
He was admitted to the Middle Temple on 19 July 1628, was knighted on 3 October 1629, and sat in the Parliament of Ireland of 1634–35 as MP either for Tuam or Galway county.