78. Rainy moon (Uchu no tsuki)

When the Emperor Go-Daigo was captured by the Hojo family and exiled in 1331, his retainer Kojima Takanori followed the convoy disguised as a farmer. One rainy night he carved a message in a cherry tree that only the Emperor would understand. For that purpose he used a Chinese poem referring the the abduction of a Chinese emperor who was eventually liberated by a loyal follower. Go-Daigo saw the message, and gained courage from it. (published in 1889)