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The first book in The D’Artagnan Romances. The Three Musketeers is set in the 17th century; it recounts the adventures of a young man named d'Artagnan after he leaves home to travel to Paris, to join the Musketeers of the Guard. D'Artagnan is not one of the musketeers of the title; those are his friends Athos, Porthos and Aramis, inseparable friends who live by the motto all for one, one for all, a motto which is first put forth by d'Artagnan.

The Three Musketeers (Les Trois Mousquetaires) is a novel by Alexandre Dumas, père. It recounts the adventures of a young man named d'Artagnan after he leaves home to become a musketeer. D'Artagnan is not one of the musketeers of the title; those are his friends Athos, Porthos, and Aramis—inseparable friends who live by the motto, "One for all, and all for one".
The story of d'Artagnan is continued in Twenty Years After and The Vicomte de Bragelonne. Those three novels by Dumas are together known as the D'Artagnan Romances.
The Three Musketeers was first published in serial form in the magazine Le Siècle between March and July 1844.