From the days of the Emperor Muretsu (499-506), direct heirs to succeed to the sceptre were wanting in more than one instance, and a unique opportunity thus offered for traitrous essays. There was none. Men's minds were still deeply imbued with the conviction that by the Tenjin alone might the Throne be occupied. But with the introduction of Buddhism (A.D. 552), that conviction received a shock. That the Buddha directed and controlled man's destiny was a doctrine inconsistent with the traditional faith in the divine authority of the "son of heaven." Hence from the sixth century the prestige of the Crown began to decline, and the puissance of the great uji grew to exceed that of the sovereign. During a short period (645-670) the authority of the Throne was reasserted, owing to the adoption of the Tang systems of China; but thereafter the great Fujiwara-uji became paramount and practically administered the empire.
For the sake, therefore, of an intelligent sequence of conception, there is evidently much importance in determining whether, in remote antiquity, the prevailing system was feudal, or prefectural, or a mixture of both. Unfortunately the materials for accurate differentiation are wanting. Much depends on a knowledge of the functions discharged by the kuni-no-miyatsuko, who were hereditary officials, and the kuni-no-tsukasa (or kokushi) who were appointed by the Throne. The closest research fails to elucidate these things with absolute clearness. It is not known even at what date the office of kokushi was established. The first mention of these officials is made in the year A.D. 374, during the reign of Nintoku, but there can be little doubt that they had existed from an earlier date. They were, however, few in number, whereas the miyatsuko were numerous, and this comparison probably furnishes a tolerably just basis for estimating the respective prevalence of the prefectural and the feudal systems. In short, the method of government inaugurated at the foundation of the empire appears to have been essentially feudal in practice, though theoretically no such term was recognized; and at a later period--apparently about the time of Nintoku--when the power of the hereditary miyatsuko threatened to grow inconveniently formidable, the device of reasserting the Throne's authority by appointing temporary provincial governors was resorted to, so that the prefectural organization came into existence side by side with the feudal, and the administration preserved this dual form until the middle of the seventh century. There will be occasion to refer to the matter again at a later date.