シーランド公国
In 2004, mountaineer Slader Oviatt carried the Sealandic flag to the top of Muztagh Ata. Also in 2007, Michael Martelle represented the Principality of Sealand in the World Cup of Kung Fu, held in Quebec City, Canada; bearing the designation of "Athleta Principalitas Bellatorius" (Principal Martial Arts Athlete and Champion), Martelle won two silver medals, becoming the first-ever Sealand athlete to appear on a world championship podium.