It has been passed down that the remnants who were defeated in the Battle of Dan no ura arrived at Ikatagoshi on the Sadamisaki Peninsula and lived in secret in the valley of the upper reaches of Miyauchi-gawa River.
壇ノ浦の合戦後、落ち延びた残党が佐田岬半島の伊方越にたどり着き、宮内川上流の谷に隠れ住んだとの言い伝えがある。