A record kept in Koryu-ji Temple and others suggest that HATA no Kawakatsu, who had established his foothold in Uzumasa, Sasarano-kori, Kawachi Province (present-day Uzumasa, Neyagawa City, Osaka Prefecture) during the sixth century, moved his base to this region given by the Imperial Court, because he succeeded in building Kadono Oi River Dam for the irrigation of the present day Katsura-gawa River (Yodo-gawa River system).
広隆寺の記録などから、6世紀頃に河内国讃良郡太秦（現在の大阪府寝屋川市太秦）を本拠地とした秦河勝が、現在の桂川(淀川水系)に灌漑工事として葛野大堰を築き、この地を朝廷より与えられ、直轄領としたかこの地に本拠を移したと考えられる。