Important measures, such as establishing Kan I junikai (twelve grades of cap rank) or the Seventeen Article Constitution, as well as sending a Japanese envoy to Tang Dynasty China, were implemented here by the Soga clan and Prince Shotoku until the death of the empress.
その後女帝死去するまでの間に、蘇我氏、聖徳太子らを中心として、冠位十二階の制定、十七条憲法の制定、遣隋使派遣などの重要施策がこの宮で行われた。