Against the background of those days, however, when most of government posts were increasingly being filled by succession, the Oe clan took the place of the Fujiwara clan, especially monopolizing the two monjo hakase posts from 934 to 943, with OE no Koretoki, the first monjo hakase coming from the Oe clan (appointed in 929), and OE no Asatsuna, who filled the other of the two posts under the monjo hakase quota.
だが、この当時どこの官職においても世襲化が進んでおり、菅原氏に代わって大江氏がその地位を占め、特に承平(日本)4年から天慶6年までは、大江氏最初の文章博士であった大江維時（延長(日本)7年任命）に加えて、大江朝綱がもう1枠の文章博士に任じられた。