Tokugawa Iesato
His early death at the age of 20 put an end to his short marriage with princess Kazu-no-Miya. Before he died he adopted a son, Tayasu Kamenosuke (later known as Tokugawa Iesato), as his heir. At that time Tayasu Kamenosuke was only 3 years old, but as the Tokugawa shogunate was at war with Chōshū, Yoshinobu was appointed the fifteenth "shōgun". "Shōgun" Yoshinobu then adopted Iemochi's adopted son, Tayasu Kamenosuke. After Iemochi's death, Kazu-no-Miya changed her name to Seikan'in no Miya. The cause of Iemochi's death is widely reported as heart failure due to beriberi, a disease caused by thiamine (vitamin B1) deficiency.