Menhir (megaliths)
It is believed that people started to live in Ozu around 10,000 B.C. It is rich in ruins and relics from Jomon and Yayoi eras such as Tago ruin. Besides, there is quite a wide variety of them and they come from different times. Around this time, when the food situation became stabilized, megaliths were worshiped. The menhir in Takayama, which is considered number one in the east, and other megaliths or complexes of megaliths were built in over 50 locations around the city.
According to the regional institution established by the Reformation of the Taika Era, Ozu belonged to Uwa county of Iyo and in 866 became independent to be Kita county. Kita county was divided into three districts: Yanogo, Kumego, and Niiyago (from “Wamyouruijusho”).
During the battle of the clans of Genji and Heike, Kita county was involved in the vortex of war. In 1185 Michinobu Kono entrenched himself in the Hiji Castle, repelling the attack of the clan of Heike (from “Yoshoki”).