 A final notable figure of this period was  Alexander of Aphrodisias,  the most important Peripatetic commentator on Aristotle. In his On Fate, Alexander sharply criticizes the positions of the Stoics. He goes on to resolve the ambiguity in Aristotle on the question of the determining nature of character on individual choices by maintaining that, given all such shaping factors, it remains open to the person when she acts freely to do or not to do what she in fact does. Many scholars see Alexander as the first unambiguously ‘libertarian’ theorist of the will (for more information about such theories see section 2 below).