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246 Pyrrhus, the former Bishop of Constantinople, was the same year reïnstalled in that see; but he only survived his restoration a few months, and was succeeded by Peter. Eugene, Bishop of Rome, was succeeded by Vitalianus, in 658. Constans, going to Rome under his episcopate, was received by him with great honours, and communicated with him, although this Emperor had never revoked his Type, and had persecuted Pope Martin and the monk Maximus, who was regarded in the East as the great defender of orthodoxy. During the episcopate of Vitalianus — fourteen years — no differences existed between the sees of Rome and Constantinople. In 664 Constans died, and Constantine Pogonatus ascended the imperial throne. In 674 Vitalianus was replaced by Adeodatus, who was succeeded by Donus. He died in 679, and Agatho was elected to the see of Rome. Peter of Constantinople had been succeeded by Constantine, who gave place, in 678, to Theodore. This Patriarch, full of pacific intentions, had sent to Donus a letter exhorting him to peace. But the Bishop of Rome did not reply, imitating his predecessors, who had given no answer to the synodical letters of the later bishops of Constantinople. This schism grieved the Emperor, who determined to reestablish friendly relations between the Eastern and Western churches. He therefore inquired of Theodore and of Macarius of Antioch as to the cause of the division. They replied: "There have been introduced new modes of speaking of the mysteries, either through ignorance or from excessive curiosity; and never, since these questions have been under discussion, have the two sees assembled to search out the truth." The Emperor concluded that the remedy for these divisions was a council, and consequently wrote thus to Donus: "Circumstances do not allow the assembling of a complete council; but