Yoshimasa was favored by KAMO no Yasunori because of his great sensitivity and love of learning and, in 1017, was promoted to Onmyo no kami a position to which even ABE no Seimei was never appointed.
感受性豊かで向学心が強かったため賀茂保憲に目をかけられ、1017年に安倍晴明もなれなかった陰陽頭（おんみょうのかみ）に昇進。