His son, Tsugaru Nobuhisa (ruled 1710-1731) was also a noted scholar, and attempted to continue his father's public works projects, but was plagued by repeated eruptions of Mount Iwaki. Ignoring sumptuary laws imposed by the shogunate, he lived in luxury while his subjects and retainers fell deeper into poverty. He continued to rule behind-the-scenes during the time of his son, Nobuaki (ruled 1731-1744), during which time the castle town of Hirosaki burned down. His grandson, Nobuyasu (ruled 1744-1784) and great-grandson Nobuakira (ruled 1784-1791), inherited a domain deeply in debt, beset by corrupt retainers, constant eruptions by Mount Iwaki, crop failures and famine.