The rice fields, which belonged to the late OTOMO no Yakamochi and were confiscated as a result of the assassination of FUJIWARA no Tanetsugu, were given to Daigaku-ryo (Bureau of Education under the ritsuryo system) and were turned into kangakuden (fields provided in order to cover expenses and provision of students).
後に藤原種継暗殺事件によって没官された故大伴家持の田地が大学寮に与えられて勧学田とされた。