One of The Three Musketeers in works by Alexandre Dumas (5)

I believe the answer is:

athos

(Other definitions for athos that I've seen before include "Greek monastic mountain" , "Greek mount; one of the Three Musketeers" , "Mount - musketeer" , "Brave soldier" , "Greek mountain; one of the three musketeers" .)

I've seen this clue in The Mirror.

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