 The full rite of investiture into the office of "Ōhōri" as practiced in the late medieval period involved the candidate first undergoing a twenty-two day period of strict ritual purification in the "Maemiya" (前宮 'old shrine'), one of the Upper Shrine's two component shrines.During the day of the ceremony itself, the "Jinchōkan" led the candidate by the hand before a sacred tree west of the "Gōdono" (神殿), the "Ōhōri"'s residence during his term located west of the "Maemiya", under which was a flat rock known as the "kanameishi" (要石 'keystone').During the ceremony, this rock is surrounded a makeshift enclosure or hut and a mat of reeds was placed over it for the boy to sit on.