In the 10th century, KAMO no Tadayuki and his son KAMO no Yasunori, and his student ABE no Seimei, having a mastery of all astronomy, Onmyodo, and calendar-making, appeared, and being an exception to people with an onmyoji hogi background who generally advanced to the Jugoinoge (Junior Fifth Rank, Lower Grade), they climbed to the Jushiinoge (Junior Fourth Rank, Lower Grade) by winning the trust of the very nerve center of the Imperial Court.
10世紀に入ると、天文道・陰陽道・暦道すべてに精通した陰陽師である賀茂忠行・賀茂保憲親子ならびにその弟子である安倍晴明が輩出し、従来は一般的に出世が従五位下止まりであった陰陽師方技出身者の例を破って従四位下にまで昇進するほど朝廷中枢の信頼を得た。