An Act of Attainder was brought against the Marquess of Exeter and he was found guilty of treason by his peers in Westminster Hall, along with other supposed conspirators.
Under interrogation, Sir Geoffrey said that Henry Pole, 1st Baron Montagu (his eldest brother), and Exeter had been parties to his correspondence with Reginald.
In January 1539, Sir Geoffrey was pardoned, and Montagu and Exeter were tried and executed for treason, while Reginald Pole was attainted in absentia.
In May 1539, Montagu, Exeter, Lady Salisbury, and others were also attainted, as her father had been; this meant that they lost their lands – mostly in the South of England, conveniently located to assist any invasion – and titles, and those still alive in the Tower were also sentenced to death, so could be executed at the King's will.
As part of the evidence given in support of the Bill of Attainder, Cromwell produced a tunic bearing the Five Wounds of Christ, symbolising Lady Salisbury's support of Roman Catholicism and the rule of Reginald and Mary; the supposed discovery, six months after her house and effects had been searched when she was arrested, is likely to be a fabrication.