The final break between Pole and Henry followed upon Thomas Cromwell, Cuthbert Tunstall, Thomas Starkey and others addressing questions to Pole on behalf of Henry. He answered by sending the king a copy of his published treatise "Pro ecclesiasticae unitatis defensione", which, besides being a theological reply to the questions, was a strong denunciation of the king's policies that denied Henry's position on the marriage of his brother Arthur’s widow and denied the royal supremacy; Pole also urged the princes of Europe to depose Henry immediately. Henry wrote to Pole's mother, the Countess of Salisbury, who in turn sent her son a letter reproving him for his "folly".