In the ninth century, when Esoteric Buddhism was brought into Japan, the ritual of kanjo commenced and the ceremony of kanjo of Esoteric Buddhism was used for the enthronement ceremony for the emperor and sokuikanjo was formed.
日本に密教が伝来した9世紀に灌頂の儀礼が開始され、やがて密教の灌頂儀式が天皇の即位式に取り入れられ、即位灌頂が成立することになる。