The sun is closely related to the Imperial family, as legend states the imperial throne was descended from the sun goddess Amaterasu. The religion, which is categorized as the ancient Ko-Shintō religion of the Japanese people, includes nature worship and animism, and the faith has been worshiping the sun, especially in agriculture and fishing. The Imperial God, Amaterasu-ōmikami, is the sun goddess. From the Yayoi period (300 BCE) to the Kofun period (250 CE) (Yamato period), the Naiko Kamonkyo (:ja:内行花文鏡, a large bronze mirror with patterns like a flower-petal manufactured in Japan) was used as a celebration of the shape of the shining sun and there is a theory that one of the Three Sacred Treasures, Yata no Kagami, is used like this mirror.