"St. Cyprian, finding other remedies only served to make the schismatics more insolent, sent a commission to the bishops and priests, whom he had appointed to act in his stead, to declare the ringleaders among them excommunicated; which was done
according to his orders. About the beginning of the year 251, St. Cyprian wrote to his flock, exhorting them to beware of being misled by the schism, which he calls more
dangerous than the persecutions of the pagans. 'There is,' says he, 'one God, and one Christ, and but one episcopal chair, originally founded on Peter, by our Lord's authority. There cannot, therefore, be erected *another altar, or another priesthood.
Whatever any man in his rage or rashness shall appoint, in defiance of the divine institution, must be a spurious, profane, and sacrilegious ordinance.'" (From:
The Life of St. Cyprian Abp. of Carthage, Butler's Lives of the Saints)