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As you know, in the world of One Piece, there are pirates who are nicknamed based on the colors of their beards. For example, Whitebeard, Blackbeard, and Brownbeard....
Now, I believe that Rock D. Xebeck's nickname was Redbeard, and his character might be inspired by a famous pirate named Barbarossa....
Hayreddin Barbarossa, also known as Redbeard, was a notorious Ottoman pirate and naval commander during the 16th century. Barbarossa's red beard and fierce reputation earned him the nickname "Redbeard" among European sailors and traders....He became the chief admiral of the Ottoman Navy and played a significant role in expanding the Ottoman Empire's maritime power in the Mediterranean sea..
Redbeard Barbarossa's navy was known for using xebecks, which were fast ships. Xebecs became the preferred ships of Barbary pirates because they were faster than contemporary ship types until the introduction of steamships...
Considering the similarities between Barbarossa and Rock D. Xebeck, it is possible that Xebeck was once a fleet admiral... that's why he might have possessed vital knowledge, such as the whereabouts of God Valley and the secrets of the Celestial Dragons, which made him a significant threat to the World Government...
As you know, in the world of One Piece, there are pirates who are nicknamed based on the colors of their beards. For example, Whitebeard, Blackbeard, and Brownbeard....
Now, I believe that Rock D. Xebeck's nickname was Redbeard, and his character might be inspired by a famous pirate named Barbarossa....

Hayreddin Barbarossa, also known as Redbeard, was a notorious Ottoman pirate and naval commander during the 16th century. Barbarossa's red beard and fierce reputation earned him the nickname "Redbeard" among European sailors and traders....He became the chief admiral of the Ottoman Navy and played a significant role in expanding the Ottoman Empire's maritime power in the Mediterranean sea..
Redbeard Barbarossa's navy was known for using xebecks, which were fast ships. Xebecs became the preferred ships of Barbary pirates because they were faster than contemporary ship types until the introduction of steamships...

Considering the similarities between Barbarossa and Rock D. Xebeck, it is possible that Xebeck was once a fleet admiral... that's why he might have possessed vital knowledge, such as the whereabouts of God Valley and the secrets of the Celestial Dragons, which made him a significant threat to the World Government...