I, Pope Calixtus, vow to Almighty God and the Holy Trinity that by war, maledictions, interdicts, excommunications, and all other means in my power, I will pursue the Turks, the most cruel foes of the Christian name.
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Letter written shortly after his election as Pope, quoted in Mandell Creighton, A History of the Papacy during the Period of the Reformation, Vol. II: The Council of Basel—The Papal Restoration, 1418–1464 (1882), pp. 346–347