Charles de Batz-Castelmore, Comte d'Artagnan (1611–1673), more popularly known as D'Artagnan, was a human who lived in France on Earth during the 17th century. He served King Louis XIII and his son Louis XIV as the Captain of the Musketeers, and later died in the Siege of Maastricht, which was part of a war between France and the Netherlands.
After the original D'Artagnan's death, a fictionalized account of his life was written by Gatien de Sandras. This account was later used by Alexandre Dumas as a basis for the fictional character of D'Artagnan which appeared in The Three Musketeers and other works by Dumas.
In 2266, while suffering from polywater intoxication, Lieutenant Hikaru Sulu became convinced that he was the character D'Artagnan. Sulu roamed the Enterprise with a fencing foil looking for Cardinal Richelieu. (TOS episode: "The Naked Time") As a result of this, Sulu was given the nickname D'Artagnan by Leslie. (TOS - The Janus Gate novel: Present Tense)