Pontefract was referred to as "Pomfret". William Shakespeare's play "Richard III" mentions the castle:<br> Pomfret is referred to in Shakespeare's Richard II also My lord, the mind of Bolingbroke is changed:You must to Pomfret, not unto the Tower.And, madam, there is order ta'en for you;With all swift speed you must away to France Pontefract suffered throughout the English Civil War. In 1648–49 the castle was laid under siege by Oliver Cromwell, who said it was "... one of the strongest inland garrisons in the kingdom." Three sieges by the Parliamentarians left the town "impoverished and depopulated". In March 1649, after the
Pontefract Priory had resulted in a reduction of the monastery's debts from 3200 marks to 350. A later, undated, visitation return gives the average number of monks at 20. Duckett prints a letter from Stephen, Prior of Pontefract in 1323, to Pierre, Abbot of Cluny, explaining that he had been prevented from making a visitation of the English Cluniac houses, owing to the presence of the king and court at Pontefract, which prevented his leaving home. In the previous year (1322) Thomas, Earl of Lancaster had been beheaded at Pontefract, and his body buried in the priory church "on the right hand