Margaret Pole was held in the Tower of London for two and a half years under severe conditions; she, her grandson (Montagu's son), and Exeter's son were held together and supported by the King. In 1540, Cromwell himself fell from favour and was himself executed and attainted. She was finally executed in 1541, protesting her innocence until the last – a highly publicised case which was considered a grave miscarriage of justice both at the time and later. Pole is known to have said that he would "never fear to call himself the son of a martyr". Some 350 years later, in 1886, Margaret was beatified by Pope Leo XIII. Aside from the aforementioned oppositional treatise, King Henry's harshness towards the Pole family might have derived from the fact that Pole's mother, Margaret, was one of the last surviving members of the House of Plantagenet. Under some circumstances, that descent could have made Reginald – until he definitely entered the clergy – a possible contender for the throne itself.