Chapter X. The Supremacy Of The Popes. 117 About the year 190 the question regarding the proper day for celebrating Easter was agitated in the East, and referred to Pope St. Victor I. The Eastern Church generally celebrated Easter on the day on which the Jews kept the Passover, while in the West it was observed then, as it is now, on the first Sunday after the full moon of the vernal equinox. St. Victor directs the Eastern churches, for the sake of uniformity, to conform to the practice of the West, and his instructions are universally followed. St. Cyprian, Bishop of Carthage, was martyred in 258. From his appeals to Pope St. Cornelius and to Pope St. Stephen, especially on the subject of baptism, from his writings and correspondence, as well as from the whole tenor of his administration, it is quite evident that Cyprian, as well as the African Episcopate, upheld the supremacy of the Bishop of Rome. Dionysius, Bishop of Rome, about the middle of the third century, having heard that the Patriarch of Alexandria erred on some points of faith, demands an explanation of the suspected Prelate, who, in obedience to his superior, promptly vindicates his own orthodoxy. [ill] St. Athanasius, the great patriarch of Alexandria, appeals in the fourth century to Pope Julius I. from an unjust decision rendered against him by the Oriental Bishops, and the Pope168 reverses the sentence of the Eastern Council. St. Basil, Archbishop of Csesarea, in the same century has recourse in his afflictions to the protection of Pope Damasus. St. John Chrysostom, Patriarch of Constantinople, appeals in the beginning of the fifth century to Pope Innocent I. for a redress of grievances inflicted on him by several Eastern Prelates, and by the Empress Eudoxia of Constantinople. St. Cyril appeals to Pope Celestine against Nestorius; Nestorius, also, appeals to the same Pontiff, who takes the 168 Socrates' Ecclesiastical History, B. II., c. xv.