Emperor Suinin is traditionally credited with watching the first recorded sumo match, the legendary bout between Nomi no Sukune and Taima no Kuehaya.
The story appears in early Japanese historical tradition and places the contest in the emperor’s reign, conventionally dated to the first century BCE. Sukune is said to have defeated Kuehaya in a brutal match, and later tradition treats Sukune as an ancestor or symbolic founder of sumo.
This account is legendary rather than a modern eyewitness record. The earliest written sources mix court history, mythology, and ritual tradition, so the episode should not be confused with the documented organization of professional sumo.
Professional sumo developed much later through court ceremonies, popular contests, and the establishment of formal associations. The ancient story nevertheless remains central to sumo’s traditional origin narrative.