The Mishihase

The Mishihase (粛填^?), also read as Ashihase and Shukushin, were a people of ancient Japan, believed to have lived along the northern portion of the coast of the Sea of Japan.

According to the Nihon Shoki, the Mishihase first arrived at Sado Island during the reign of Emperor Kimmei.

In 660, Japanese General Abe no Hirafu defeated the Mishihase in Watarishima at the request of the Emishi.

A theory by Arai Hakuseki in Edo period proposed that Watarishima was Ezo, which was later renamed to Hokkaidō. The battle place was recorded as the mouth of a large river, which is proposed to be Ishikari River.^[1]

They are believed to have spoken a Tungusic language.^{[citation needed]}
 
The Emishi or Ebisu (蝦夷^?) constituted a group of people who lived in northeastern Honshū in the Tōhoku region which was referred to as michi no oku (道の奥^?) in contemporary sources.
Ezo (蝦夷^?, also spelled Yezo or Yeso) is a Japanese name which historically referred to the lands to the north of Japan. It was used in various senses, sometimes meaning the northern Japanese island of Hokkaidō, and sometimes meaning lands and waters further north in the Sea of Okhotsk, like Sakhalin and the Kuril Islands. The word Ezo could also refer to the peoples that the Japanese encountered in these lands, referred to in modern times as the Ainu people.