In Kyoto, there is "tera natto," a type of stringy natto introduced during the Kamakura period that continues to be made today in some temples and temple towns. There is also a theory that itohiki natto originated in Kyoto, with one anecdote stating, "In the late Heian period, warrior Minamoto no Yoshiie carried boiled beans wrapped in straw as military rations, and the name natto developed from that." Another anecdote is that, "During the Nanboku-cho period, villagers presented boiled beans wrapped in straw to Emperor Kogon, who spent his later years at a temple in Keihoku. The beans became stringy, and when eaten with salt, they were so delicious that villagers shared them with others, and the custom spread throughout the region." Keihoku natto was later presented to the Imperial Palace, and the custom is said to have continued until the end of the Edo period. The Muromachi period Otogi Zoshi also contains descriptions of itohiki natto as a food source for the nobility, and it seems that it became a common food around this time.