It has been passed down that after being defeated in the battle of Yashima, 30 remnants led by Taira no Noritsune escaped to Awa Province via the Sanuki Mountains and lived in the area of present Higashimiyoshi-cho, Tokushima Prefecture, and Ikawa-cho (Tokushima Prefecture, present Miyoshi City), but later they settled at Iya for fear of pursuers.
屋島の合戦に敗れた平教経率いる30名の残党が、讃岐山脈を経て、阿波へと入り、現在の徳島県東みよし町から井川町(徳島県)（現・三好市）にかけての一帯に住んだが、追手に脅かされ、祖谷に住んだと伝わる。