The term "agatanonushi" refers to a post or kabane (hereditary title) of Yamato sovereignty (the ancient Japan sovereignty) before the introduction of the ritsuryo system (a system of centralized government based on the ritsuryo code).
県主(あがたのぬし)は、律令制が導入される以前のヤマト王権の職種・カバネ（かばね)の一つである。