Yoritomo would probably have deferred conclusive action in such circumstances had there not reached him from Miyoshi Yasunobu in Kyoto a warning that the Taira were planning to exterminate the remnant of the Minamoto and that Yoritomo's name stood first on the black-list.
He was personally known to Yoritomo, and he was instrumental in securing the services of the astute Oye no Hiromoto, whose younger brother, Chikayoshi, was governor of Aki at the time of receiving Yoritomo's invitation. His descendants received the uji of Nagai and Mori; those of Yasunobu, the uji of Ota and Machine, and those of Chikayoshi, the uji of Settsu and Otomo.
The third of the Bakufu offices was the Monju-dokoro, or "place for recording judicial inquiries;" in other words, a high court of justice and State legislature. Suits at law were heard there and were either decided finally or transferred to other offices for approval. This office was established in 1184. The first occupant of the post was Miyoshi Yasunobu.
This Miyoshi Yasunobu,* as well as the representative of the Nikaido who occupied the post of shitsuji in the Man-dokoro; the Oye family, who furnished the president of the latter, and the Nakahara, who served as the secretaries, were all men of erudition whom Yoritomo invited from Kyoto to fill posts in his administrative system at Kamakura.
Then the lady Masa summoned Miyoshi Yasunobu and asked his opinion. He said: "The fate of the Kwanto is at stake. Strike at once." Thereupon Hojo Yoshitoki ordered Yasutoki, his son, to set out forthwith from Kamakura, though his following consisted of only eighteen troopers. Thereafter, other forces mustered in rapid succession. They are said to have totalled 190,000.
He offered to them careers which were not open in Kyoto, and their ready response to his invitations was a principal cause of the success and efficacy that attended the operation of the Bakufu system in the early days. *Miyoshi Yasunobu held the office of chugu no sakan in Kyoto.