Tomita Tsunejirō , born Yamada Tsunejirō , was the earliest disciple of judo. His name appears in the first line of the enrollment book of the Kōdōkan. Tomita, together with Saigō Shirō, became the first in the history of judo to be awarded the rank of Shodan by the founder of judo, Kanō Jigorō, who established the ranking system that is now commonly used in various martial arts around the world. Tomita was known as one of the "Four Kings" of Kōdōkan judo for his victorious efforts in competing against jujitsu schools. He was awarded 7th dan upon his death on January 13, 1937.

Judo is an unarmed modern Japanese martial art, combat sport, Olympic sport, and the most prominent form of jacket wrestling competed internationally. Judo was created in 1882 by Kanō Jigorō as an eclectic martial art, distinguishing itself from its predecessors due to an emphasis on "randori" instead of "kata" alongside its removal of striking and weapon training elements. Judo rose to prominence for its dominance over established jujutsu schools in tournaments hosted by the Tokyo Metropolitan Police Department, resulting in its adoption as the department's primary martial art. A judo practitioner is called a "judoka" , and the judo uniform is called "judogi" .