It is written that YAMANOUE, being implicated in the Rebellion of HIKAMI no Kawatsugu in 782, was demoted to the post of Oki no kami (actually a form of banishment) aside from his serving as Onmyo no kami during the years of Enryaku (Shoku nihongi).
延暦年間に陰陽頭を勤めたという記録のほか、782年（延暦元年）には、氷上川継の謀反（氷上川継の乱）に連座して、隠岐介に左遷（実態は流罪）されたとの記録もある（続日本紀）。