Prince Sanjo belonged to the eighth _Kuge_ family, and was therefore a descendant of the Fujiwara house which has from very early days provided consorts for the Emperors. The mothers and wives of the sovereigns of Japan have all been Fujiwaras by descent, and the rule still holds good that the princesses of the blood shall marry into Fujiwara houses. The retention of Prince Sanjo in the office of Prime Minister on the establishment of the Dai-jo-kwan was a wise step of which the good effects were incalculable, inasmuch as it tended towards the reconcilement of those antagonistic sections of the community which were to be classed respectively as adherents of the old and of the new systems. At the beginning he was himself an opponent of the _kai-koku_ policy which favoured the opening of the country to foreign trade and intercourse, but in the end he vastly aided the accomplishment of those plans to which he had finally accorded his unqualified approbation. As a Fujiwara he could not be other than a devoted servant of the throne,—as a convert to the doctrine of reform he was a pillar of strength to the Government of the Restored Imperial Rule, and a strenuous advocate of the adoption of methods calculated to place his country in the van of Asiatic powers. The Fujiwaras in the ninth century assumed regal control, in their tenure of the office of Kwambaku,—an ancient title borne by the Prime Minister of the State,—and the holder of it in A.D. 888 had wielded absolute sway, arranging all affairs with and on behalf of the then reigning Mikado, who seems to have been content to efface himself and to permit the Minister to exercise sovereign powers. Thus the prestige of the Fujiwara house was a valuable prop to the edifice of State and the influence exerted by the prince as Premier throughout his long occupancy of the exalted office was ever thrown into the scale of solid advancement.