“Koretoshi Maruyama was born in Nihonbashi, Tokyo, on October 5, 1936. He graduated from the Economics Department of Keio University in March of 1956, after which he joined his father’s business, Maruyama Manufacturing. He became interested in the martial arts from his Middle School years, and at his father’s urging he took up Judo and earned a black belt. Again at his father’s urging, in his first year of college, he entered the Rikidozan School of Professional Wrestling, and also trained in weight lifting and boxing, while continuing his training in Judo at the Kodokan.”
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