When the war between father and sons resumed in Easter 833, Gregory was approached by Lothair, seeking his intervention to bring about reconciliation between Lothair and his father. He was convinced to leave Rome and travel up to join Lothair, in hopes that his intervention would promote peace, but in practice this action annoyed the Frankish bishops who followed Louis, who believed that Gregory was actively supporting Lothair. Suspicious of Gregory’s intent, they refused to obey the pope, and threatened to excommunicate him, were he to excommunicate them, and even to depose him as pope. Annoyed by their actions, Gregory's response was to insist upon the papal supremacy, the papacy being superior to the emperor. He stated: