Phobos occupies a complex semantic and psychological position in the depth-psychology corpus, functioning simultaneously as a Greek lexical term for fear, a mythological personification, and a conceptual anchor for the study of emotion in classical thought. Konstan’s sustained philological treatment — the most substantial engagement in the corpus — establishes that phobos is not semantically equivalent to all Greek fear-words: it carries connotations of flight, physical perturbation, and social contagion that distinguish it from the more cognitively inflected deos. Konstan dismantles earlier attempts, notably by Romilly, to assign a clean cognitive/affective binary between the two terms, arguing that ordinary Greek usage does not sustain such a partition. In Aristotle, phobos receives formal definition in the Rhetoric and connects to cathartic theory in the Poetics, where it is paired with pity as constitutive of tragic effect. The term appears also in mythological registers — Vernant’s index records Phobos as a named deity within the Hesiodic cosmogony, son of Ares, companion to Deimos — situating it within a network of personified psychic forces that depth psychology has mined for archetypal resonance. For practitioners such as Hollis, the phenomenology of fear the term names becomes a therapeutic threshold: the inescapability of what one dreads, and the necessity of passing through rather than circumventing it, becomes the work of individuation.