The emperor reformed the central government system, increasing the number of ministers from one to three, namely the Minister of the Left, the Minister of the Right, and the Minister of the Inside (Uchitsuomi: senior adviser to the emperor).
その後も、今までは蘇我氏の大臣1人だけの中央官制を左大臣・右大臣・内臣の3人に改めた。