Tokugawa Ienari
When Tsugaru Nobuakira, the 8th "daimyō" of Tsugaru Domain died without heir in 1791, Yasuchika was posthumously adopted into the main Tsugaru house as his successor, and the Kuroishi holding was turned over to his Yasuchika's eldest son. He was received in formal audience by "shōgun" Tokugawa Ienari the same year.