This quote is taken from a curious bit of history when the Church was torn by the Arian heresy.
"This event [the death of (anti) Pope Felix] was, no doubt, ordained by God, that the seat of Peter might not be dishonored by the occupancy of two bishops; for such an arrangement is a sign of discord, and is foreign to ecclesiastical law."
Click here to share on Facebook.~Ecclesiastical History of Sozomen, ca. AD 440
After the death of Constantine the Great in AD 337, sole rule of the empire eventually devolved upon his son, Constantius II. While Constantius was just as devoted to achieving unity within the Church as was his father before him, he unfortunately lacked his father’s patience and light touch when dealing with ecclesiastical affairs. In AD 355, Constantius was so fixated on unifying the Nicean orthodox, semi-Arian and Arian parties, that he deposed and exiled Pope Liberius when the latter refused to sign a condemnation of Saint Athanasius, the champion of orthodoxy who steadfastly opposed the heresy of Arius.
While Liberius was in exile, the Roman clergy elected a new pope—Felix II. Felix reigned for a little over a year, but it seems that the people of Rome never accepted him. In fact, they agitated loudly for the recall of Pope Liberius. In AD 357, Constantius gave in and ended the exile of Liberius. Why this happened is a matter of vigorous scholarly debate even to this day, and the ancient sources are quite confused. Did Liberius give in and sign documents assenting to a semi-Arian formula and condemning St. Athanasius? Did he recant upon his return to Rome? Or did he remain steadfast until the emperor simply ended his exile to appease the people of Rome?
These questions are probably not answerable, but once Constantius allowed Liberius to return to Rome, a curious thing happened, according to the 5th century ecclesiastical historian, Sozomen:
The bishops who were then convened at [a synod in] Sirmium wrote to Felix, who governed the Roman church, and to the other bishops, desiring them to receive Liberius. They directed that both should share the throne and discharge the priestly duties in common, with harmony of mind; and that whatever illegalities might have occurred in the ordination of Felix, or the banishment of Liberius, might be buried in oblivion.Having two popes at the same time was a radical, unworkable solution to the problem. For the people of 4th century Rome, the idea of two popes was a complete non-starter. They welcomed Liberius back like a conquering hero. Felix, in the meantime, was chased out of the city, but it seems he never renounced the papal office. Sozomen concludes this episode, saying:
The people of Rome regarded Liberius as a very excellent man, and esteemed him highly on account of the courage he had evinced in opposing the emperor, so that they had even excited seditions on his account, and had gone so far as to shed blood. Felix survived but a short time; and Liberius found himself in sole possession of the church. This event was, no doubt, ordained by God, that the seat of Peter might not be dishonored by the occupancy of two bishops; for such an arrangement is a sign of discord, and is foreign to ecclesiastical law.
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Interestingly, Liberius is the first pope in the 350 year history of the Church to that point who was not considered a saint of the Latin Church, though he is revered as such in the East. Felix II, however, was considered a saint, at least for a time.