In the latter Sengoku period, a lord's residence was constructed within the main walls of their castle at the top of the mountain, while the lord made his vassals and their clans live on the mountainsideas as his hostages.
戦国後期には山上の主曲輪に領主の居館を構えて中腹に家臣たちと人質としてその一族を住まわせた。