the Agathos Daimon is a very primitive fertility-spirit, a conception that long preceded any of the Olympians. He is indeed the inchoate material out of which, as we shall presently see, more than one Olympian is in part made.
Harrison's central thesis: the Agathos Daimon is not a late theological abstraction but a pre-Olympian fertility-spirit who constitutes the generative substrate from which Olympian figures are partly derived.
, Themis: A Study of the Social Origins of Greek Religion, 1912thesis