Claim: From Viterbo in 1267, Jayme Alaric de Perpignan carried the letter from Clement and James to the Mongols for them to join the Franco-Mongol alliance against the Islamic caliphates.
Evidence: From Viterbo in 1267, they sent a letter, carried by Jayme Alaric de Perpignan. Clement and James had been encouraged by this, towards the possibility that the Mongols might join the Europeans in a Franco-Mongol alliance against the Muslims.