Takasago Uragorō (Japanese: 高砂 浦五郎; born Inosuke Yamasaki (山崎 伊之助, Yamasaki Inosuke), November 20, 1838 – April 8, 1900) was a Japanese sumo wrestler from Yamabe District, Kazusa Province (now Tōgane, Chiba Prefecture). His highest rank was maegashira 1. Although he never reached a high rank in professional sumo, Takasago is a personality known for having led the first social movements of sumo wrestlers in Japan and for having founded the eponymous stable which is still active and still bears his name.
Source: “Takasago Uragorō”, English Wikipedia (CC BY-SA 4.0), excerpt
