Imagawa Sadayo , also known as Imagawa Ryōshun , was a renowned Japanese poet and military commander who served as tandai ("constable") of Kyūshū under the Ashikaga bakufu from 1371 to 1395. His father, Imagawa Norikuni, had been a supporter of the first Ashikaga shōgun, Ashikaga Takauji, and for his services had been granted the position of constable of Suruga Province. This promotion increased the prestige of the Imagawa family considerably, and they remained an important family through to the Edo period.

Ashikaga Yoshimitsu was the third shōgun of the Ashikaga shogunate, ruling from 1368 to 1394 during the Muromachi period of Japan. Yoshimitsu was Ashikaga Yoshiakira's third son but the oldest son to survive, his childhood name being Haruō (春王). Yoshimitsu was appointed shōgun, a hereditary title as head of the military estate, in 1368 at the age of ten; at twenty he was admitted to the imperial court as Acting Grand Counselor.