Musketeer with "great personal beauty and intelligence of mind" (5)

I believe the answer is:

athos

(Other definitions for athos that I've seen before include "Mount - musketeer" , "Greece's holy mount" , "Greek mount; one of the Three Musketeers" , "Comrade of Porthos and Aramis" , "Appropriating" .)

I've seen this clue in The Washington Post.

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