In The Three Musketeers, Athos and the other two musketeers, Porthos and Aramis, are friends of the novel's protagonist, d'Artagnan. He has a mysterious past connecting him with the villain of the novel, Milady de Winter. The oldest of the group by some years, Athos is described as noble and handsome but also taciturn and melancholy, drowning his secret sorrows in drink. He is very protective of d'Artagnan, the youngest, whom he eventually treats as a son. By the end of the novel, it is revealed that he is the Count de la Fère. He was once married to Milady de Winter and attempted to kill her after discovering that she was a criminal on the run, an event which left him bitter and disillusioned. However, during the course of this novel, he is able to get his revenge on Milady. In the second novel, Twenty Years After, he has retired from the Musketeers and abandoned his nom-de-guerre of Athos. He has fathered an illegitimate son, Raoul, with Marie de Rohan and then adopted the boy, making him the vicomte de Bragelonne. Fatherhood makes Athos a much happier man, but after launching Raoul into a military career, Athos looks for new causes to occupy his life. He embraces the Fronde and then a doomed mission to rescue Charles I of England. He is uncharacteristically terrified by the appearance of Mordaunt, Milady's son, who is attempting to avenge the death of his mother. Athos, despite his reluctance to engage with the son of his ex-wife, ends up forced to slay him in an underwater fight in the Thames. In the third novel, The Vicomte de Bragelonne, Athos takes a major behind-the-scenes part in historical events, first helping with the restoration of Charles II to the throne of England, and then being entrusted with the diplomatic task of arranging the wedding of Henrietta of England and Philippe I, Duke of Orléans. Athos eventually falls out with King Louis XIV of France, who has seduced his son Raoul's fiancée, and is briefly thrown into the Bastille for voicing his contempt. After being pardoned at d'Artagnan's instigation, Athos withdraws to his home, where he dies of sorrow after Raoul is killed at war. Athos's first name is never told in the novels. However, in Dumas's play "The Youth of the Musketeers," the young Milady, then named Charlotte, calls him "Olivier."
In film and television
Actors who have played Athos on screen include:
Herbert Delmar, in The Three Musketeers: Parts I and II
Alfred Hollingsworth, in The Three Musketeers
Henri Rollan, in Les trois mousquetaires
Léon Bary, in The Three Musketeers and The Iron Mask
Henri Rollan, in Les Trois Mousquetaires
Paul Lukas, in The Three Musketeers
Douglass Dumbrille, in The Three Musketeers
Van Heflin, in The Three Musketeers
John Hubbard, in The Three Musketeers
Steve Brodie, in Lady in the Iron Mask
Jean Martinelli, in Les Trois Mousquetaires
Paul Hansard, in The Three Musketeers
Domenico Modugno, in The Three Musketeers
Barry Morse, in The Three Musketeers
Georges Descrières, in Les Trois Mousquetaires: La Vengeance de Milady and Les Trois Mousquetaires: Les Ferrets de la Reine
Franco Fantasia, in D’Artagnan contro i tre moschettieri
Jeremy Watson, in The Three Musketeers
Jeremy Young, in The Further Adventures of the Three Musketeers
The south-east Asianstone loachSchistura athos is named after the character of Athos, and there are two more species in the genus Schistura which are each named after one of the Three Musketeers, S. aramis and S. porthos.