It was a culture developed during the Sekkan seiji (regency government) period from the early 10th century to the 11th century and has much influenced the culture during the Insei (cloister government) period in the 12th century.
10世紀の初め頃から11世紀の摂関政治期を中心とする文化であり、12世紀の院政期文化にも広く影響を与えた。