Threnos — the ritual lamentation over a slain or dying figure — occupies a structurally indispensable position within the depth-psychology corpus precisely because it bridges religious ritual, dramatic form, and the psychology of transformative suffering. Jane Ellen Harrison’s monumental Themis furnishes the foundational account: threnos is the fourth stage in the Eniautos-Daimon sequence (Agon, Pathos, Messenger, Threnos, Anagnorisis, Epiphany), the necessary descent into collective mourning before resurrection can occur. Harrison reads threnos not as mere funeral sentiment but as the ritual container for a paradoxical clash of grief and triumph — the death of the old year that simultaneously inaugurates the new. Edward Edinger, in his alchemical psychology, registers threnos as a technical term within the morphology of tragic drama and correlates it with the mortificatio stage of psychic transformation. Stephan Hoeller, drawing explicitly on this same fourfold dramatic schema, situates threnos as the third moment in a ‘Gnostic process’ of individuation — the mourning that follows agon and pathos and precedes theophania. Across these treatments, threnos functions not as passive weeping but as the psyche’s necessary encounter with loss, the ground of eventual recognition and renewal. The term thus stands at the intersection of ritual studies, Jungian process psychology, and the archetypal reading of Greek dramatic structure.