He served the Uesugi clan, but later switched allegiances and became a retainer of the Takeda clan of Kai Province.
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In the 16th century, the Akiyama clan were noted relatives of the Takeda clan of Kai province.
As a response to Hōjō's intervention in his invasion of Suruga Province, Shingen came into Musashi Province from his home province of Kai, attacking Hachigata and Takiyama Castles, where Ujiyasu's sons repulsed them.
He was sent as the governor of Kai, Izumi and Awaji provinces, and on his return to Kyoto was asked to participate in the compilation of the Kokin Wakashū.
A small post town existed in this area since the Heian period, as Oyama is located at the base of the Ashigara Pass on the main route connecting the ancient provinces of Sagami with Kai and Suruga Provinces.