What is the X in X-mas?
1580s, "one who cultivates one of the fine arts," from Middle French artiste (14c.), from Italian artista, from Medieval Latin artista, from Latin ars (see art (n.)).
Originally used especially of the arts presided over by the Muses (history, poetry, comedy, tragedy, music, dancing, astronomy), but also used 17c. for "one skilled in any art or craft" (including professors, surgeons, craftsmen, cooks). Now especially of "one who practices the arts of design or visual arts" (a sense first attested 1747).