In those days, Hiraizumi where the Oshu Fujiwara clan had its residences boasted a large population second to Heiankyo (Kyoto) and was a great city of the Buddhist culture.
この時代、奥州藤原氏が館をおいた平泉町は平安京に次ぐ人口を誇り、仏教文化を成す大都市であった。