The "Three Musketeers" is a historical novel written by Alexandre Dumas in 1844. It follows the adventures of a young man named d'Artagnan who aspires to become a musketeer, a member of the elite guard serving the king of France. The story features three main musketeers: Athos, Porthos, and Aramis, who become d'Artagnan's close friends and allies. Set in the 17th century, the novel explores themes of friendship, loyalty, and honor. The musketeers engage in various duels and political intrigues, often clashing with the villainous Cardinal Richelieu. The phrase "All for one and one for all" encapsulates their strong bond and commitment to each other.