 Now that the papal participation in the plot against him had become clear, Frederick wrote to the noblemen to inform them of the pope's vile behavior, and marched with an army to Lyon in 1247.Once he had arrived in Turin, however, he received news that Parma had rebelled again.According to Salimbene di Adam, a group of Guelph Parmigian refugees who had taken shelter in Piacenza led by Ugo di Sanvitale (the brother of the new bishop of Parma) and Bernardo di Rolando Rossi (the pope's brother-in-law and a former collaborator of Frederick).