Some excellent sekitai, believed to be family treasures, were made in the Heian Period and were mentioned in literature, such as ones of 'kigata' (ogre shape), 'shishigata' (lion shape) and so on.
平安時代には家宝とされる名物の石帯も生まれ「鬼形」「獅子形」など文献に名を残すものもある。