After he was promoted to Dainagon (chief councilor of state), he held political power greater than his seniors, including Sadaijin (Minister of the Left) MINAMOTO no Toru under the reign of Emperor Yozei and Emperor Koko and issued many kanpu (official documents from Dajokan, or Great Council of State) as Imperial orders in his capacity of chief official.
大納言昇進後の陽成天皇・光孝天皇治世下においては上席の左大臣源融らを凌ぐ権勢を持ち、上卿として多くの官符を奉勅宣布している。