Other legendary "luchadores" who helped popularize the sport include Gory Guerrero, who is credited with developing moves and holds which are now commonplace in professional wrestling; Blue Demon, a contemporary of Santo and possibly his greatest rival; and "Mil Máscaras" (Man of A Thousand Masks), who is credited with introducing the high flying moves of lucha libre to audiences around the world. He achieved international fame as one of the first high-flyers, something he was not considered in Mexico, where he fell under the mat-power category.