According to a legend told in Yanagawa City, Fukuoka Prefecture, Kamachi-jo Castle was built by FUJIWARA no Suminori, and TACHIBANA no Kimiyori resisted it by building Yanagawa-jo Castle.
福岡県柳川市に伝わる伝承では、蒲池城は藤原純乗が築き、橘公頼は柳川城を築いて対抗したとされる。