At least two generations of smiths signing "Nobukuni", and working in the Yamashiro tradition in Kyoto during the fourteenth century were believed to have been descended from Ryokai, although one is said to have studied under Sadamune of Soshu. At least one smith moved to Tsukushi (Chikuzen and Chikugo Provinces) around the Oei era. The signatures Minamoto Saemon no Jo and Shikibu no Jo are found on work of this period. The name Nobukuni is found thereafter in different contexts, occurring as the surname of a number of Edo-period smiths. The signature on this sword is that of Minamoto Saemon, identifiable by his custom of interchanging the left and right components of the character "kuni."