The Muse occupies a richly contested position across the depth-psychology corpus, functioning simultaneously as theological personification, psychological mechanism, creative catalyst, and interpersonal projection. The ancient sources — Hesiod, Homer, and their scholarly interpreters — ground the Muses in a cosmogony of memory: daughters of Mnemosyne and Zeus, they are the mediating powers between divine omniscience and the mortal poet’s bounded recall. Dodds, Snell, Havelock, and Detienne each approach this genealogical fact from different angles, registering it as a theory of knowledge, an account of oral transmission, or a proto-psychology of inspired consciousness. The key tension is between the Muse as genuinely external source of divine overflow and the Muse as internalized creative function — a tension that ancient invocation formulae already stage, and that modern depth psychology inherits. Rank pushes hardest at this seam: he dismantles the Romantic Muse-as-beloved as a projection of the artist’s bisexual creative drive, insisting that neither the concrete woman nor the psychoanalytic mother-substitute explains the inner generativity the Muse supposedly mediates. Campbell reintegrates the Muses into a cosmological aesthetics, reading them as earthly heralds of transcendent harmony, while Kerenyi and Beekes map the mythological and etymological terrain. The figure of the Muse thus marks a persistent fault-line between a depth-psychological reading of inspiration as unconscious process and an older sacred claim that creativity is genuinely visited upon the artist from without.