Asonuma Chikatsuna

Chikatsuna was a son of Asonuma Hirotsuna. He inherited Tōno manor in Hei District, Mutsu Province, and from 1213 to 1219 built Yokota Castle on Mount Gomadō as his seat of government.

For his service in the Jōkyū War of 1221 he was made jitō of Yano-Arayama manor in Aki Province, where he is credited with building Tokonoyama Castle and founding the Aki branch of the clan.