The Court rank and title of Moromitsu was, even at his peak, Shogoinoge (Senior Fifth Rank, Lower Grade) and Ukyo no daibu (Master of the Western Capital Offices), because he became an adopted child of FUJIWARA no Yorinaga, who was the pupil of Moromitsu's real father Moroyori, and he himself was not so good at work.
父師頼の弟子だった藤原頼長の猶子になったことに加えて、自身の無才のため官途は振るわず、正五位下右京大夫にとどまった。