After the Hogen no ran War (turmoil of the Hogen war) was concluded, FUJIWARA no Shinzei worked on national administrative reform and the Dai-dairi (place of the Imperial Palace and government offices) was reconstructed under Shinzei's leadership in October of 1157.
保元の乱が終結すると藤原信西は国政改革に取り組み、保元2年（1157年）10月、信西の主導により大内裏が再建された。