Japan: From the Japanese Government History
“ Those who obtained the posts of provincial governors acquired large influence in the districts administered by them, their descendants becoming military chiefs with great followings of relatives and retainers. The Minamoto clan comprised no less than fourteen families, among them the descendants of the Emperor Seiwa being the most numerous and important. It was from this clan that the great Yoritomo, the first feudal ruler of Japan, subsequently sprang. The Taira, on the other hand, consisted of four families, principally descendants of the Emperor Kwammu. ”
