Columbia subject headings:
Harvard subject headings:
Castles--Japan--Kōchi-ken.
Ichijō family.
Kōchi-ken (Japan)--Antiquities.
Kōchi-ken (Japan)--History--To 1600.
Kōchi-ken (Japan)--Social conditions--To 1600.
Princeton subject headings:
Ichijō family.
Kōchi-ken (Japan)--History.