It is said that wrestling similar to Sumô took place over 2000 years ago. Today´s national sport of Japan is still performed in the traditional fashion with different kinds of rituals and conventions, which have remained virtually unchanged. In the Edo period (1603-1868) the first Sumô federations were founded, which were later united to form today’s Nihon Sumô Kyôkai, the “Japanese Sumo Federation”. With the raise of bushi (warrior) society, Sumô was used as a martial art to discipline both mind and body. It is performed in a circular earthern ring called dohyô.