It is identified that these tiles and the tiles found in the Yamashiro Kokubun-ji historic remain which was built after the Kuninomiya was ruined, were made with the same mold, and therefore there is no doubt that the Shigaraki no Miya Palace was a temple.
恭仁宮廃都後に建立された山城国分寺の塔跡と同笵瓦であることが確認されていることから、寺院であることは疑いない。