Trivia (origin of sushi)

This piece found in the Trivia section of the movie is fascinating:

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According to a well-known legend in the Kazuchi District, sushi was invented in the 15th Century by renowned monk Muziguchi (1412-1474). During the third Kubaki revolts, he was wounded while traveling and left for dead by his companions in a forest with only some cooked rice in a bag. Muziguchi stumbled upon a freshly dead dog. Driven by hunger and fighting for survival, he cut the dog open and placed small pieces of raw flesh on rice. Back in Kyoto, he replaced the dog meat with fish meat (salmon, tuna and meal) and convinced his fellow monks to taste it. Sushi's popularity spread in Kyoto and soon in the entire medieval Japan.
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I knew of the importance and the legacy of Muziguchi and his religious order but I didn't know that his life is connected to the origin of sushi. That is cool!