another. Although she was the sister of Cardinal Hélie Talleyrand, the King prevailed. Bishop In 1354 he was made bishop of Patti and Lipari and In 1354-1358, Peter Thomas, promoted bishop of Patti and Lipari7, was sent to Serbia with the main objectives of putting an end to the vexatious measures against the Catholics of Serbia and evaluating the intentions of Stefan Dusan concerning his desire to unify the Orthodox Church of Serbia with the Roman Catholic Church. Dusan's goal was in fact to find political support in order to set out, under the cover of defense of the Catholic faith, to conquer Byzantium and its Empire. In view of the complex geopolitical situation and the lack of honesty of the ruler of Serbia, this mission of Peter Thomas did not succeed, in spite of his efforts. In the spring of 1356, Thomas, with the Dominican Guglielmo Conti, bishop of Sizebolu, went to Venice and met with Louis I of Hungary to arrange a peace treaty between Venice and Hungary over Dalmatia, but despite his efforts, the negotiations became bogged down and no peace treaty was signed. In April 1357, Thomas went as papal legate to Constantinople, to receive the submission of the Emperor of Byzantium to the Roman Catholic Church in exchange for military support of the West to block the expansion of the Ottoman Empire. But the military supports promised in the exchanges does not materialize. In 1358, Peter Thomas went on a private pilgrimage to the Holy Land. In 1359, Pope Innocent VI appointed Peter Thomas Universal Legate for the East. In the summer of 1359, Bishop Thomas left for Smyrna accompanied by a fleet supplied by the Venetians and the Hospitallers of Rhodes. He strengthened the city's defenses, paid the soldiers, ensured the supply of the city and the appointment of a new governor. He also went to Constantinople and took part in the battles of Lampsach. Philippe de Mezières wrote: "Physically involved in the battle, Pierre Thomas stimulated the troops: it was necessary to avoid a stampede [in front of the janissaries]. The bishop gave of himself, he encouraged, he struck, sword in fist ". Between defeats and victories, Pierre Thomas was "tireless, leading the troops into battle by his example and his exhortations, sometimes in Smyrna, sometimes in Rhodes, sometimes in Constantinople, sometimes in Cyprus, sometimes in the island of Crete, and sometimes in