“The myths of the heroes of Athens, from Cecrops to Theseus, show them as kings, that is as functionaries, and, in primitive times, these functionaries assume snake-form. The daimon-functionary represents the permanent life of the group.
The individual dies, but the group and its incarnation the king survive. Le roi est mort, vive le roi. From these two facts, of group permanency and individual death, arose the notion of reincarnation, palingenesia.
Moreover, since the group included plants and animals as well as human members, and these were linked by a common life, the rebirth of ancestors and the renewed fertility of the earth went on pari passu.
Hence the Intichiuma ceremonies of Central Australians, hence the Revocation of ghosts at the Athenian Antkesteria. Gradually, as the group focussed on its king, the daimones of fertility, the collective ancestors, focussed on to an Agathos Daimon, a spirit of fertility, again figured as a snake.”
Jane Ellen Harrison, Themis–A Study of the Social Origins of Greek Religion, 1912. P. xiv.