It is said that Seimei wrote the masterpiece of Onmyodo 'Kinugyokutoshu,' but on the other hand, many argue that it was given to him by 伯道上人 who taught Onmyodo to him.
陰陽道の名典「金烏玉兎集」を著したとも言われているが、伯道上人に教えを受けた際にこれを授けられたという説も多い。