A mound on the hill may have been a Bronze Age burial barrow. In 1133, the hill was part of a manor that Henry I gave to a baron called Richard de Balta. During Henry II's reign it was passed to Alexander de Barentyn, the king's butler. The area that was known as Traitors' Hill, may have acquired its current name during the English Civil War in the 17th century. When it was occupied by troops loyal to the English Parliament. A legend states that this was the site from where Guy Fawkes and Robert Catesby, of the Gunpowder Plot on November the 5th 1605, planned to watch the destruction of Parliament.