Kamo no Yasunori (賀茂の保憲) was an onmyōji, a practitioner of onmyōdō, during the Heian period in Japan. He was considered the premier onmyōji of his time. Yasunori was the son of the onmyōji Kamo no Tadayuki. According to a tale in the Konjaku Monogatarishu, at the age of ten, Yasunori accompanied his father to an exorcism, where he w...