In addition, both the Taira clan government and the Yoritomo government had a historic problem, "controlling Insei" (government by cloistered emperors), and were governments that occurred because of this situation, therefore this term is not appropriate historically and it is considered appropriate to add the era/year.
更に、平氏政権も頼朝政権も共に「院政の克服」という歴史的課題を背負い、その中から生じた政権であることなどから、歴史学上はこの呼称は適切とは言えず、年号を付して呼ぶ方が妥当であるとされる。