There is a legend stating that on July 16, 1169, at the age of 96, he became a giant snake at Sakuraga-ike Pond (Omaezaki City) in Shizuoka Prefecture and went into Bosatsu-gyo practice, wanting to earn the spiritual power to save people.
96歳の時、人々を救う霊能を得ようと1169年（嘉応元年）6月13日、静岡県の桜ヶ池(御前崎市)で大蛇となって菩薩行に入ったという伝説がある。