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Ruby Robert was the nickname of Bob Fitzsimmons, a renowned boxer in the late 19th and early 20th centuries. The moniker originated from his reddish hair and fair complexion, which gave him a distinct appearance in the ring. Fitzsimmons was a formidable fighter, holding world titles in three different weight classes, including heavyweight. His nickname, Ruby Robert, became synonymous with his boxing prowess and enduring legacy in the sport.