John the Good was succeeded by his son Manuel, whose strength and weakness combined to give a deathblow to the empire. Manuel was a mere knight-errant, who loved fighting for fighting’s sake, and allowed his passion for excitement and adventure to be his only guide. His whole reign was one long series of wars, entered into and abandoned with equal levity. Yet for the most part they were successful wars, for Manuel was a good cavalry officer if he was but a reckless statesman, and his fiery courage and untiring energy made him the idol of his troops. At the head of the veteran squadrons of mercenary horsemen that formed the backbone of his army, he swept off the field every enemy that ever dared to face him. He overran Servia, invaded Hungary, to whose king he dictated terms of peace, and beat off with success an invasion of Greece by the Normans of Sicily. His most desperate struggle, however, was a naval war with Venice, in which his fleet was successful enough, and drove the Doge and his galleys out of the Ægean. But the damage done to the trade of Constantinople by the Venetian privateers, who swarmed in the Levant after their main fleet had been chased away, was so appalling that the Emperor concluded peace in 1174, restoring to the enemy all the disastrous commercial privileges which his grandfather Alexius had granted them eight years before. [Illustration] Hunters. (_From a Byzantine MS._) (_From "L’Art Byzantin." Par Charles Bayet, Paris, Quantin, 1883._) The main fault of Manuel’s wars was that they were conducted in the most reckless disregard of all financial considerations. With a realm which was slowly growing poorer, and with a constantly dwindling revenue, he persisted in piling war on war, and on devoting every bezant that could be screwed out of his subjects to the support of the army alone. The civil service fell into grave disorder, the administration of justice was impaired, roads and bridges went to decay, docks and harbours were neglected, while the money which should have supported them was wasted on unprofitable expeditions to Egypt, Syria, or Italy. So long as the ranks of his mercenaries were full and their pay forthcoming, the Emperor cared not how his realm might fare. Of all Manuel’s wars only one went ill, but that was the most important of them all, the one necessary struggle to which he should have devoted all his energies. This was the contest with the Seljouks, which ended in 1176 by a disastrous defeat at Myriokephalon in Phrygia, brought about by the inexcusable carelessness of Manuel himself, who allowed his army to be caught in a defile from which there was no exit, and routed piecemeal by an enemy who could have made no stand on the open plains. Manuel then made peace, and left the Seljouks alone for the rest of his reign.