The view asserting that the plan for Fukuhara-kyo by the Heike family was a plan for a system of multiple capitals with Heiankyo, and that Kamakura, where Kamakura bakufu (Japanese feudal government headed by shogun) was located, bore the functions of a capital with Kyoto, therefore, the multi-capital system existed in Kamakura era.
平氏政権による福原京の計画が平安京との複都構想だったとし、また鎌倉幕府の置かれた鎌倉が、京都と首都機能を分担した事実上の複都制であるとするもの。