It's often seen beside art (4)

I believe the answer is:

thou

(Other definitions for thou that I've seen before include "Old-fashioned pronoun" , "Prominent pronoun of the King James Bible; the modern-day 'you'" , "Second person in the Bible" , "1,000 (abbr)" , "You, poetically of old" .)

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

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