Regarding the origin of this event, there are several theories including; it originated in the custom in China that they ate dumplings with grain mixed at the time of boar on the day of boar, which was adopted to a court function in Japan; it originated in an incident that occurred in the ancient Imperial Court.
歴史的には、古代中国で旧暦10月亥の日亥の刻に穀類を混ぜ込んだ餅を食べる風習から、それが日本の宮中行事に取り入れられたという説や、古代における朝廷での事件からという伝承もある。