In 785, he was arrested and executed as a mastermind of the assassination of FUJIWARA no Tanetsugu which occurred in Nagaoka-kyo (the ancient capital of Nagaoka) during Emperor Kanmu's visit.
785年（延暦4年）桓武天皇の行幸中長岡京で起きた藤原種継暗殺事件で主謀者として逮捕され、処刑された。