Signatures on papal bulls indicate that Cardinal Simon was back in Viterbo by 11 January 1268. In a letter of 14 or 15 January 1268, Pope Clement IV wrote to Cardinal Simon de Brion that he had heard that the Cardinal had fallen from his horse and in the accident had injured his leg. He also wrote that Conradin and Ludwig Duke of Bavaria were at Verona, and were pressing for Pavia. A general war was likely. Cardinal Simon's injury must not have been severe, since, on 3 April 1268, the Pope wrote to him with the request (not an order) that he undertake a legation to Germany (Teutonia), if he wished and if it were possible. The Pope needed a prudent and faithful man, who had clean hands and eyes wide open, who could stay centered on the business and let himself stray neither right nor left, who could preserve the Empire, keep the Apostolic See free from scandal, and the neighboring kingdoms free from danger. In vetting names, Simon seemed the most suitable.