also known as the "Boston Strong Boy", was an American boxer recognized as the first heavyweight champion of gloved boxing, holding the title from February 7, 1882, to 1892. He is generally recognized as the last heavyweight champion of bare-knuckle boxing under the London Prize Ring Rules.
The theater folk have long been taking that view of things, as is amply attested by the histrionic careers (for examples) of Mrs. Lily Langtry and Mr. John L. Sullivan. Managers—and, we may add, the public—do not consider it of the least importance what Mrs. Langtry does on the stage, nor how she does it, so long as she is a former favorite of a Prince and a tolerably fair counterpart of a Jersey cow. And who cares what Mr. Sullivan’s pronunciation of the word “mother” may be, or what degree of sobriety he may strive to simulate?
Ambrose Bierce. The March Hare (1911)
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Sullen Sullivan came with a caution: Is believed armed, and should be considered extremely dangerous.