As Ieyasu TOKUGAWA was believed to have been born after his mother, Odai no kata, prayed to Yakushi Nyorai enshrined at the Horai-ji Temple (Shinshiro City, Aichi Prefecture) as its principal image, it is also said that Ieyasu TOKUGAWA was the reincarnation of Yakushi Nyorai, a principal image of the Horai-ji Temple, who appeared in the human world.
また、徳川家康は生母於大の方が鳳来寺（愛知県新城市）の本尊の薬師如来に祈願して誕生したと言われ、徳川家康は鳳来寺（愛知県新城市）の本尊の薬師如来が人間界に現れたものとも言われる。