WrestleMania is considered World Wrestling Entertainment's (WWE) flagship event, having first been held in 1985. It is the longest-running professional wrestling event in history and is held annually between mid-March to mid-April. It was the first of WWE's original four pay-per-views, which includes Royal Rumble, SummerSlam, and Survivor Series, dubbed the "Big Four". It has been described as the Super Bowl of sports entertainment. The event featured wrestlers from the Raw, SmackDown, and ECW brands.