There are references to the founding of Koryu-ji Temple in ancient texts such as "Nihon Shoki" and it has been confirmed by excavations that the temple dates from the 7th century, but the ancient records were lost to fire in the year 818 and the temple's early history cannot be determined for sure.
『日本書紀』等に広隆寺草創に関わる記述があり、発掘調査の結果等からも草創が7世紀にさかのぼる古寺であることは確かだが、弘仁9年（818年）の火災で古記録を失ったこともあり、初期の歴史は必ずしも明確ではない。