Emperor Juntoku (1197-1242), third son of Emperor Go-Toba, shared his father’s ambition to overthrow the Kamakura shogunate. Educated in waka poetry and court ritual, he authored the Kinpisho (treatise on imperial protocol) and Yakumo Misho (poetics). After abdicating in 1221 to support his father’s war preparations, he was exiled to Sado Island after the failed Jokyu War. He spent 21 years on Sado composing poetry, including his Hyakunin Isshu poem “Momoshiki ya” — the closing poem of that anthology, symbolizing the end of the classical court era. When the 1242 death of Emperor Shijo offered a chance for his son’s enthronement, the shogunate rejected the Juntoku line in favor of the Tsuchimikado branch. Juntoku starved himself to death at age 46, three years after his father.