Taking into account a scale of Jikifu (a vassal household allotted to courtier, shrines and temples) under the later Ritsuryo system, Tomokuyu at that time seems to have not been a part of Ahachimanokoori but a whole district, and range of the district included later Ikeda District, possibly wider.
後の律令制の下での食封の規模をあてはめれば、湯沐邑は安八磨郡の一部ではなく、郡全体にあたるのではないかと考えられ、その郡の範囲は後の池田郡を含み、さらに広かった可能性もある。