1/3 of the Musketeers.
The friend of the Three Musketeers (but not one of them) in the
book by Dumas.
d'Artagnan was one of The Three Musketeers, and was a fictional
character created by Alexandre Dumas. He is loosely based on a real
person - Charles de Batz-Castelmore, Comte d'Artagnan.
Charles de Batz-Castelmore, Comte d'Artagnan (c. 1611-1673)
served Louis XIV as captain of musketeers and died at the Siege of
Maastricht in the Franco-Dutch War