Alone among the vicissitudes of these troublous times the strength and influence of Buddhism grew steadily. The great monasteries were military strongholds as well as places of worship. When the emperor Kwammu chose Kioto for his capital, he established on the hill of Hiyei-zan, which lay north-east of the city, a magnificent temple to ward off the evil influences supposed to emanate from that quarter. Twenty years later, Kobo, the most famous of all Japanese Buddhist saints, founded on Koyasan in Yamato a monastery not less important than that of Hiyei-zan. These and many other temples had large tax-free estates, and for the protection of their property they found it expedient to train and arm the cenobites as soldiers. From that to taking active part in the political struggles of the time was but a short step, especially as the great temples often became refuges of sovereigns and princes who, though nominally forsaking the world, retained all their interest, and even continued to take an active part, in its vicissitudes. It is recorded of the emperor Shirakawa (1073-1086) that the three things which he declared his total inability to control were the waters of the river Kamo, the fall of the dice, and the monks of Buddha. His successors might have confessed equal inability. Kiyomori, the puissant chief of the Taira family, had fruitlessly essayed to defy the Buddhists; Yoritomo, in the hour of his most signal triumph, thought it wise to placate them. Where these representatives of centralized power found themselves impotent, it may well be supposed that the comparatively petty chieftains who fought each for his own hand in the 15th and 16th centuries were incapable of accomplishing anything. In fact, the task of centralizing the administrative power, and thus restoring peace and order to the distracted empire, seemed, at the middle of the 16th century, a task beyond achievement by human capacity. Nobunaga, Hideyoshi and Iyeyasu.