Daijō-daijin
The Daijō-daijin or Dajō-daijin was the head of the Daijō-kan during and after the Nara period and briefly under the Meiji Constitution. Equivalent to the Chinese Tàishī. Wikipedia
Past holder: Fujiwara no Uchimaro
Chancellor / Chief Minister: Daijō-daijin
Imperial Household: Kunai-shō
Minister of the Center: Naidaijin
Minister of the Left: Sadaijin
Minister of the Right: Udaijin