 There has been some discussion about Syrianus’ originality because we possess a commentary of books 6–14 of Aristotle’s Metaphysics that claims to be by the hand of Alexander of Aphrodisias and which shares numerous passages with Syrianus’ work (concordances in Luna and Dillon/O’Meara). Even though the commentary is most certainly not by Alexander, it still remains essentially unclear which author is dependent on whom. Most scholars accept the view, however, that the commentary by Ps.-Alexander was produced during the Byzantine Renaissance, most likely by Michael of Ephesus (early 12th cent.), and is therefore dependent on Syrianus.