D'Artagnan is a fictional character from the novel "The Three Musketeers," written by Alexandre Dumas in 1844. He is a young and ambitious Gascon who travels to Paris to join the elite group of musketeers serving the king of France. D'Artagnan is known for his bravery, loyalty, and skill in swordsmanship. Throughout the story, D'Artagnan befriends three musketeers: Athos, Porthos, and Aramis. Together, they embark on various adventures, facing political intrigue and personal challenges. D'Artagnan's character embodies the themes of friendship, honor, and the fight against injustice.