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 who were named Utigurs and Cotrigurs respectively, in the course of which they mutually destroyed each other, much to the advantage of the Byzantines. At the same time a fleet of biremes was sent up the Danube to assist in the retaliative operations. Soon after the departure of the enemy, a great concourse of citizens, with the Emperor himself at their head, although now probably in his seventy-seventh year, went out from the capital to survey the Long Walls; and Justinian continued to reside in the vicinity all the summer engaged in supervising the restoration of that bulwark.

In 562 a definite and comprehensive treaty was at last concluded with Persia, by which Chosroes agreed to relinquish all claim to Lazica in consideration of an annual payment of thirty thousand solidi (£17,000). This peace, which was to remain in force for fifty years, was the final diplomatic achievement of Peter Magister, who died soon after, on his return to Constantinople. During the next year Justinian undertook a pilgrimage to Myriangeli, a holy place in Galatia, at a distance of three hundred miles from the capital, being the longest journey he had made since he mounted the throne. On his return, octogenarian though he was, a conspiracy to assassinate him was promoted by some officials who had access to the Palace, but the design was betrayed by one of the associates of the plot. Many arrests were made, and some of the prisoners tried to save themselves by pretending that they had merely been suborned by Belisarius. The general was summoned before the Imperial council for interrogation, and, although there was no evidence to sub-*