Kotoōshū Katsunori (Japanese: 琴欧洲 勝紀) (legal name: Karoyan Andō, born February 19, 1983 as Kaloyan Stefanov Mahlyanov, Bulgarian: Калоян Стефанов Махлянов, in Dzhulyunitsa, Veliko Tarnovo Province, Bulgaria) is a former professional sumo wrestler or rikishi. He made his debut in 2002, reaching the top division just two years later. In 2005, he reached the rank of ōzeki or 'champion', the second-highest level in the sumo ranking system behind only yokozuna. On May 24, 2008, Kotoōshū made history by becoming the first European sumo wrestler to win an Emperor's Cup. He was one of the longest serving ōzeki in sumo history, holding the rank for 47 consecutive tournaments until November 2013. In January 2014 Kotoōshū obtained Japanese citizenship, a requirement of becoming an elder in the Japan