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Sumo (pron. su-moh) wrestling originated in Japan as a ritual ceremony to the gods of good harvest. It is said that the Japanese people came about through the outcome of a Sumo contest between the gods. Sumo gained the patronage of the Imperial Court in the 8th century and never lost popularity.
I recommend that you read the full article on Wikipedia: Jujutsu. What follows is a summary about the forces that shaped Jiu Jitsu and it's children arts of Judo and BJJ. Jiu Jitsu originated in feudal Japan around 500 years ago. As always, it came from some older roots, but the main focus was the Japanese feudal battlefield.