The term ‘Year Daimon’ — rendered in Harrison’s technical coinage as ‘Eniautos-Daimon’ — stands as one of the most generative constructs in the depth-psychological reading of Greek religion. Jane Ellen Harrison, its principal architect, forged the concept in Themis (1912) to designate a class of divine figures whose essence is not personality but cyclical function: the rhythmic waxing, crisis, death, and renewal of the world-year. Harrison explicitly distinguishes Eniautos from etos, insisting that the former names not a chronological segment but a biological cycle of increase and decay. The Year Daimon thus precedes and underlies the Olympian pantheon, which Harrison reads as a later, individualizing overlay upon these older, collective, functionary powers. Dionysus, Herakles, Helios, and Orestes are each treated, at various points, as instantiations or derivatives of the type, with Dionysus occupying a special and troubled position — differentiated from ordinary Year Daimons precisely because he does not straightforwardly die. The term ramifies outward into festival, drama, agon, and initiation; it connects the seasonal dromenos to Tragedy’s formal structure of Contest, Lamentation, and Resurrection. Depth psychology after Harrison inherits this figure as an archetype of cyclical selfhood, appearing in Hillman’s daimon theory as the individuating force inherent to a life-pattern from its origin.