Critical editions of Homer discuss three special steps in this process. First is the hypothetical "Peisistratean recension". There is a long-standing, but somewhat old-fashioned, tradition in modern scholarship which holds that in the mid-6th century BCE the Athenian tyrant Peisistratus had the Homeric epics compiled in a definitive edition. It is known that under Peisistratus, and later, rhapsodes competed in performing Homer at the Panathenaic festival; and a scholion on "Iliad" 10.1 accuses Peisistratus of inserting book 10 into the "Iliad". But there is little evidence for a Peisistratean recension, and most present-day scholars doubt its existence; at the very least it is disputed what is to be understood by the term "recension". The second and third key moments are the critical editions made by the 3rd and 2nd century BCE Alexandrian scholars Zenodotus of Ephesus and Aristarchus respectively; both of these scholars also published numerous other works on Homer and other poets, none of which survive. Zenodotus' edition may well have been the first to divide the "Iliad" and "Odyssey" into 24 books.