- Billy Madden was born on December 10, 1852 in London, England, UK. He died on February 22, 1918 in White Plains, New York, USA.
- Credited with coining the phrase "knock out".
- Boxing manager. Among the fighters he managed were John L. Sullivan, Jack Dempsey, Jack McAuliffe, Sailor Sharkey, and Gus Ruhlin.
- Manager of Nonpareil Jack Dempsey, the great middleweight champion, not the famous heavyweight champion.
- Former bare-knuckle lightweight world champion.
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