But Irene's services to the Church were not allowed then, any more than we should allow them now, to preserve her in power. The stars in their courses seemed to the superstitious to fight against her, and, though she held the crown she had so ill-won for five years, the end came at last by the treachery of those she had raised to highest place. "For five years," says Gibbon, "the Roman world bowed to the government of a female; and, as she moved through the streets of Constantinople, the reins of four milk-white steeds were held by as many patricians, who marched on foot before the golden chariot of their queen." But among the patricians whom she had chosen was the treasurer Nicephorus, who on October 31, 802, having captured his benefactress, and with some spark of generosity, undestroyed by his ambition and his avarice, sent her to banishment rather than to death, ascended the throne of the Cæsars. With him began a new dynasty, a new century, and in some ways a new era for the imperial city. During the eighth century Constantinople, as a city, underwent a great change. This was not merely due to the incessant ebb and flow of population, the coming and going of different detachments of the imperial army, the founding of new monasteries by men from all parts of the Christian world, the opening of new commercial establishments, the coming of new trading embassies, but to one great and irremediable disaster. From 745 to 747 the city was devastated by the plague, that bubonic distemper, so familiar already but now more terribly destructive than ever before. The words of Theophanes, who lived when the remembrance of it was still fresh, though they have been often quoted, may be quoted again. They stand side by side with the modern records of the still powerful pestilence. "And in the spring of the first indiction (747) the pestilence spread to a greater extent, and in summer its flame culminated to such a height that whole houses were entirely shut up, and those on whom the office devolved could not bury their dead. In the embarrassment of the circumstances, the plan was conceived of carrying out the dead on saddled animals, on whose backs were placed frameworks of planks. In the same way they placed the corpses above one another in waggons. And when all the burying-grounds in the city and suburbs had been filled, and also the dry cisterns and tanks, and very many vineyards had been dug up, the gardens too within the old walls were used for the purpose of burying human bodies, and even thus the need was hardly met." [Illustration: THE AQUEDUCT OF VALENS]