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DYNASTIC STBUGGLES IN EMPIEE 87 still continued with Matthew, the son of Cantacuzenus, was soon disposed of. An agreement had been arrived at before the withdrawal of his father by which Matthew should retain the title of emperor and remain in possession of certain districts of the Ehodope mountains, and of the island of Lemnos. A few months later the island was exchanged for a lordship in the Morea. Shortly afterwards Matthew was made prisoner by the Serbians, delivered to John, and, after he had been kept for a while prisoner in Tenedos, abdicated and retired in 1358 to the Morea. John had no liking for religious controversies within his own Church, and although Cantacuzenus in his retirement wished that the most important of them should be continued John forbade it. There was a curious theological contro- versy, related by the writers of the time, which is of value as showing that in the midst of the most grave political diffi- culties the Byzantine people had not yet lost their interest in religious questions. Barlaam, a Calabrian abbot of the Greek Church — who, as we have seen, had been sent to Eome to negotiate for Union and aid because, among other reasons, he was well acquainted with Latin, ' better indeed than with Greek ' 1 — charged certain monks at Mount Athos and their followers, known as Bogomils, with heresy, called them Omphalopsychae, Messalians, men who believed that by looking long at their navel they could see God with mortal eyes, 2 or at least with the uncreated light of Mount Tabor. Barlaam's great opponent was Palamas, archbishop of Salonica. The party headed by Palamas was favoured by Cantacuzenus, whose mother, indeed, was a Bogomil. The controversy waxed fierce and bitter, but Barlaam was unable to obtain the condemnation he desired. It raged for fifteen years until forcibly put an end to by John on the withdrawal of his colleague. 3 ' Greg. xi. 10. 2 Ibid. 3 The Bogomils still exist in Eastern Rumelia. One may be sceptical as to the doctrines in which, according to their enemies, they believed. Apparently they were quietists, searchers after the Inner Light, who would have nothing to do with the worship of Eikons, were possibly Unitarians, and had a tendency in many directions towards what may be called reformation principles. Their