As a result, the point was reached where onmyoji came exclusively from the Kamo and Abe clans and when ABE no Akichika, the grandson of ABE no Seimei, was assigned as Onmyo no kami, a policy was announced to permanently appoint the Kamo family members to reki hakase and the Abe family members to tenmon hakase and thereafter, the Kamo and Abe clans virtually monopolized all of the posts in Onmyoryo that were originally not designed to be inherited by succession.
このため、賀茂氏・安倍氏からのみ陰陽師が輩出されることとなり、安倍晴明の孫安倍章親が陰陽頭に就任すると、賀茂家出身者に暦博士を、安倍家出身者に天文博士を常時任命する方針を表し、その後は賀茂氏と阿倍氏が、本来世襲される性格ではない陰陽寮の各職位を両家の世襲でほぼ独占した。