[1] Furthermore, Haukase, a 17th-century Ishikari Ainu chief, stated that "we are ancestors of the Takaoka (currently Hirosaki), went to the Tsugaru Peninsula for maritime trade".
[2] Though there are no records detailing the Ishikari Ainu pre-1600s, Around the time of Shakushain's rise to power in the mid 17th-century, the aforementioned Haukase was building a large native force to influence the Ainu living in the Ishikari river basin from Mashike to Otaru.
[2] In the face of Shakushain's revolts and general turbulence on Hokkaido, Haukase consistently stayed neutral.
Even after the end of Shakushain's Revolt, Haukase resisted the Matsumae clan's embargo on Ainu goods and demands for submission.
The Ishikari Ainus' population sharply declined since, due to the destruction of traditional ways of life and introduction of infectious diseases, from over three thousand in 1809 to around 600 in 1855.