A fortified hilltop settlement dating from the middle of the Yayoi period was found in the Uzumasa in Kawachi Province (the Uzumasa site), and artifacts of the fifth to sixth centuries relating to Toraijin (the Chinese and Koreans who settled in Japan in the fourth to seventh centuries), have been excavated (from a cluster of nearby burial mounds).
これを検討すると、河内国太秦には弥生中期頃の高地性集落（太秦遺跡）が確認されており、付近の古墳群からは5~6世紀にかけての渡来人関係の遺物が出土（太秦古墳群）している。