Fuyutsugu was installed as Kurodo no to (Head Chamberlain, the chief of the newly-founded Kurodo dokoro (Chamberlain's Office)) in 810, which was the head secretary to the Emperor (or the Chief Cabinet Secretary), and compiled and presented a considerable group of laws and regulations, the Konin kyaku-shiki.
冬嗣は810年、天皇の筆頭秘書官（又は官房長官）と言うべき蔵人頭（新設官庁である蔵人所の長官）に就任し、一大法令群である弘仁格式を撰上した。