The three ancient commentaries on Aristotle'sOn the Soul (De anima) are interesting because the commentators, as neo-Platonists, understand the soul completely differently than Aristotle. For them, the soul is the inseperable life principle of the body, a spiritual entity. In response to this challenge, the commentator Priscian (ca. 530 AD) develops the most detailed antique theory of human self-consciousness, which is reconstructed here for the first time.