The BYB Extreme Fighting Series, the most recent organized attempt at restoring bare-knuckle fighting to become a sanctioned sport, is perhaps the greatest current example of bare-knuckle boxing. The series was founded in 2005 by former world heavyweight champion Mike Tyson. Bare-knuckle boxing is a form of combat where the fighters wear little or no protective gear other than their fists and teeth. The fights usually take place with no time limits and can go on for hours. There are several historical examples of bare-knuckle boxing including those fought by John L. Sullivan, Bob Fitzsimmons, and Tommy Burns. It also has its roots in 19th-century England where it was known as "fist and foot" fighting because that's what you needed to do to win. Bare-knuckle boxing is coming back into popularity due to promoters such as Mike Tyson who believe that it will attract more spectators if it is made into a legitimate sport rather than a form of entertainment. In May 2005, Tyson announced the creation of the BYB Extreme Fighting Series with the goal of having it become licensed by the World Bare Knuckle Boxing Association. He planned to hold eight annual tournaments throughout the world with a $1 million prize fund. However, none of the events have taken place as of 2013.