The request prompted Adrian of Utrecht, the regent appointed by Charles V, to declare that Charles would lose Castile if she granted her support. Although she was sympathetic to the Comuneros, she was persuaded by Ochoa de Landa and her confessor Fray John of Avila that supporting the revolt would irreparably damage the country and her son's kingship, and she therefore refused to sign a document granting her support. The Battle of Villalar confirmed that Charles would prevail over the revolt.