Masatoshi Nakayama was a prominent Japanese martial artist, best known for his contributions to karate. Born in 1913, he played a significant role in popularizing Shotokan karate worldwide. Nakayama was a student of Gichin Funakoshi, the founder of Shotokan, and he dedicated his life to teaching and spreading the art. In addition to his teaching, Nakayama authored several influential books on karate, which helped to standardize techniques and training methods. He also established the Japan Karate Association (JKA) in 1955, which became a leading organization for karate practitioners globally, promoting competitions and instructor training.