The Heichi Dojo only surviving dojo of the Heichi Bushi school. The main building was in the castle town of Boar's Flanks, just outside the gates of the castle Heichi sano Negura itself, in the isolated and remote valley known as the Lair. There were usually three sensei in the Heichi Dojo, with a new one chosen whenever his predecessor retired or died. Guest samurai were free to use its facilities, since they would never be allowed to leave the Lair and thus could not betray the secret techniques of the Boar.