Contrary to popular belief that the Nagaoka-kyo was unfinished and abandoned, the construction of Nagaoka-kyo was nearly complete, as shown in the reconstruction of not only the old palaces such as Naniwa no Miya but also the buildings in Heijo-kyo.
未完成で放棄されたとした従来の定説と異なり、難波宮や他の旧宮、はたまた平城京の建造物までが移築され、かなり完成した姿であった。