The title Earl of Bolingbroke has been created twice, once in the Peerage of England and once in the Jacobite Peerage. The creation in the Peerage of England occurred on 28 December 1624, when Oliver St John, 4th Baron St John of Bletso, was created Earl of Bolingbroke. His eldest son and heir apparent, Oliver St John, was in 1641 summoned to the House of Lords through a writ of acceleration in his father's junior title of Baron St John of Bletsoe. However, he predeceased his father (killed at the Battle of Edgehill in 1642); nevertheless, the writ of acceleration means that he is formally known as the fifth Baron St John of Bletsoe. The Earl was succeeded by his grandson, Oliver St John, 2nd Earl of Bolingbroke, who was the son of Sir Paulet St John, younger son of the first Earl. The 2nd