In the "Shoki" (stands for Nihonshoki), it is written that Emperor Jomei issued the imperial edict, 'In this year, we found Omiya (the imperial major palace) and Odera (major temple)' and he made the edge of Kudara-gawa River of the place for the imperial palace.
『書紀』には、舒明天皇が「今年、大宮と大寺を造る」と詔（みことのり）し、百済川のほとりを宮の地とした旨の記述がある。