Speaker of the line "I follow him to serve my turn upon him" (4)

I believe the answer is:

iago

(Other definitions for iago that I've seen before include "Othello's evil counsellor" , "stage villain" , "Shakespeare's jealous villain" , "Othello's treacherous counsellor" , "Advisor to soldier" .)

I've seen this clue in The New York Times.

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