Wrestling legend Hossein Khosrow Ali Vaziri, best known by his ring name The Iron Sheik, has passed away at the age of 81. Sheik's personal Twitter account confirmed the news, noting that he passed away peacefully. Sheik was one of the most iconic figures in professional wrestling history, having an impact on the sport far beyond his in-ring career. When he was an active competitor, Sheik wrestled for WWF, Jim Crockett Promotions, the National Wrestling Alliance, World Class Championship Wrestling and dozens of other independent territories. He is best known for his rivalry with Hulk Hogan, as that feud is largely credited for putting professional wrestling on the global map. Sheik was inducted into the WWE Hall of Fame as part of the Class of 2005.