Armand, Seigneur de Sillègue, d'Athos, et d'Autevielle ("Lord of Sillègue, Athos, and Autevielle"), better known as Armand d'Athos (c. 1615 – December 21, 1643), was a Gascon Black Musketeer[1] of the Maison du Roi in 17th-century France. He took his name from the small market town of Athos-Aspis on the Gave d'Oloron, close to Sauveterre-de-Béarn and Autevielle.[2] Athos was the first cousin once removed to the Comte de Troisville and first cousin of Isaac de Porthau.
According to the semi-fictional Mémoires de M. d'Artagnan, he formed a close friendship with Henri d'Aramitz and the aforementioned de Porthau, and they were called the "three brothers".[3][4] He served as the inspiration for Alexandre Dumas's character Athos in The d'Artagnan Romances.