Formation of All Japan Sumo Association

Date: December 28, 1925 • Location: Tokyo, Japan

The Tokyo Grand Sumo Association became the All Japan Sumo Association at the instigation of Prince-Regent Hirohito, laying the foundations for the world's sole professional sumo association.

The Japan Sumo Association , officially the Public Interest Incorporated Foundation Japan Sumo Association ; sometimes abbreviated JSA or NSK, and more usually called Sumo Kyōkai, is the governing body that operates and controls professional sumo wrestling, called ōzumō (大相撲), in Japan under the jurisdiction of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT).