Kikuchi clan
Nanboku-chō period is between 1336 and 1392. Emperor Go-Daigo started to overthrow the shogunate Hōjō Takatoki and the order to join in the revolt was given by Prince Kanenaga (or Prince Kaneyoshi) to various samurai groups in Kyūshū. Kikuchi Taketoki was killed in a battle in Fukuoka. The Kikuchi and Aso clans sided with the Southern Court in Kyoto. Later, the Northern Court won over the Southern Court. In order to strengthen the Kikuchi clan, Kikuchi Takeshige was made Yoriaishu Naidan no Koto in 1338, meaning the rules of decision within the Kikuchi clan were made with blood signature. This was translated into the Kikuchi Constitution, the oldest blood signature, and this was stored in the Kikuchi Shrine.