of large segments of Greek society in Bithynia and elsewhere." In 1269 Michael sent his brother the despotes John Palaiologos into the southern part of Byzantine Anatolia to clear the Maeander and Cayster valleys of Turkmen; their response was to fall back before the Byzantine army, and when John was eventually recalled to face foes in Europe, the Turkmen pushed back and resumed their conquests and settlement. Thus by 1269, the cities of Trachia Studia and Strobilos on the Carian coast were firmly Turkish possessions. Michael's response to the Treaty of Viterbo was to attempt to weaken papal support for it; if the Pope was convinced Charles of Anjou's invasion was a just and holy war, then the forces Michael could call on could not prevent its success. Michael returned to negotiating a union of the churches with Pope Clement IV, which he had agreed to, but the latter's death in November 1268 put an end to this approach. According to Geanakoplos, only a lack of resources prevented Charles from immediately launching an attack against Michael. Looking for some restraint on Charles, Michael made a shrewd appeal to King Louis IX of France, the leading ruler of the West and the elder brother of Charles. Louis was more interested in a crusade against Muslims controlling the Holy Land than attacking a schismatic Christian. So he had Charles join his Tunisian crusade in 1270. When Louis died in Tunisia, Charles took command, negotiated a truce, and sailed to Sicily, planning to attack Byzantium. At this point a miracle saved Michael: a violent storm destroyed Charles' fleet. "To the Greeks of Byzantium," writes Geanakoplos, "it must have seemed as if the Virgin, their protector, had saved them from disaster." After a three year interregnum, during which Charles of Anjou attempted to sway the election, a new pope was elected, Gregory X. When Michael restarted talks of union, Gregory proved to be less accommodating and negotiated from a position of strength. Michael attempted to reason with Patriarch Joseph and the synod of the importance of agreeing to this union, and that the principle of oikonomia (which Geanakoplos suggests is best translated here as "considerations of self-interest") required them to accede to papal demands. But despite a propaganda campaign over the winter of 1274–1275, Michael was forced to depose Patriarch Joseph and replace him with his own supporter John Bekkos in order to obtain