Under the council system by nayashu (wealthy merchants who led autonomous organizations in cities), who were egoshu (members of council), it established autonomy and refused control by sengoku daimyo by surrounding the whole city with a moat and employing ronin as mercenary.
会合衆である納屋衆による合議制の元、自治を行い、都市全体に濠を巡らし、牢人を傭兵として雇うなど、戦国大名による支配も拒絶していた。