In addition, Dokyo is believed to have learned and acquired a secret method of Sukuyo (an astrology based on the Sutra of constellations and planets) of Esoteric Buddhism during his retreat in Mt. Katsuragi in Yamato Province (present-day Nara Prefecture).
また大和国（奈良県）の葛城山に篭り密教の宿曜秘法を習得したとも言われる。