Unryū Kyūkichi (Japanese: 雲龍 久吉; 1822 – June 15, 1890; name also read as Unryū Hisakichi) was a Japanese sumo wrestler from Yanagawa, Chikugo Province. He was the sport's 10th yokozuna. Although the name of the style of the yokozuna 's in-ring ceremony is named after him, the fact that he himself practiced this style is highly debated.
Source: “Unryū Kyūkichi”, English Wikipedia (CC BY-SA 4.0), excerpt