When the ancestors of the Hellenic race came from Asia, they must have brought with them a nature-worship, akin to that which subsequently appeared in India in the earliest hymns of the Vedas. Comparative Philology, as we have before seen, has established the rule, that whatever words are common to all the seven Indo-European families must have been used in Central Asia before their dispersion. From this rule Pictet[220] has inferred that the original Aryan tribes all worshipped the Heaven, the Earth, Sun, Fire, Water, and Wind. The ancestors of the Greeks must have brought with them into Hellas the worship of some of these elementary deities. And we find at least two of them, Heaven and Earth, represented in Hesiod's first class of the oldest deities. Water is there in the form of Pontus, the Sea, and the other Uranids have the same elementary character.

The oldest hymns in the Vedas mark the second development of the Aryan deities in India. The chief gods of this period are Indra, Varuna, Agni, Savitri, Soma. Indra is the god of the air, directing the storm, the lightning, the clouds, the rain; Varuna is the all-embracing circle of the heavens, earth, and sea; Savitri or Surja is the Sun, King of Day, also called Mitra; Agni is Fire; and Soma is the sacred fermented juice of the moon-plant, often indeed the moon itself.

As in India, so in Greece, there was a second development of gods. They correspond in this, that the powers of nature began, in both cases, to assume a more distinct personality. Moreover, Indra, the god of the atmosphere, he who wields the lightning, the thunderer, the god of storms and rain, was the chief god in the Vedic period. So also in Greece, the chief god in this second period was Zeus. He also was the god of the atmosphere, the thunderer, the wielder of lightning. In the name "Zeus" is a reminiscence of Asia. Literally it means "the god," and so was not at first a proper name. Its root is the Sanskrit Div, meaning "to shine." Hence the word Deva, God, in the Vedic Hymns, from which comes Θεος and Δις, Διος in Greek, Deus in Latin. Ζευς Πατερ in Greek is Jupiter in Latin, coming from the Sanskrit Djaus-piter. Our English words "divine," "divinity," go back for their origin to the same Sanskrit root, Div. So marvellously do the wrecks of old beliefs come drifting down the stream of time, borne up in those frail canoes which men call words. In how many senses, higher and lower, is it true that "in the beginning was the Word."

This most ancient deity, god of storms, ruler of the atmosphere, favorite divinity of the Aryan race in all its branches, became Indra when he reached India, Jupiter when he arrived in Italy, Zeus when in Epirus he became the chief god of the Pelasgi, and was worshipped at that most ancient oracular temple of all Greece, Dodona. To him in the Iliad (XVI. 235) does Achilles pray, saying: "O King Jove, Dodonean, Pelasgian, dwelling afar off, presiding over wintry Dodona." A reminiscence of this old Pelasgian god long remained both in the Latin and Greek conversation, when, speaking of the weather, they called it Zeus, or Jupiter. Horace speaks of "cold Jupiter" and "bad Jupiter," as we should speak of a cold or rainy day. We also find in Horace (Odes III. 2: 29) the archaic form of the word "Jupiter," Diespiter, which, according to Lassen (I. 755), means "Ruler of Heaven"; being derived from Djaus-piter. Piter, in Sanskrit, originally meant, says Lassen, Ruler or Lord, as well as Father.

In Arcadia and Boeotia the Pelasgi declared that their old deities were born. By this is no doubt conveyed the historic consciousness that these deities were not brought to them from abroad, but developed gradually among themselves out of nameless powers of nature into humanized and personal deities. In the old days it was hardly more than a fetich worship. Hêrê was worshipped as a plank at Samos; Athênê, as a beam at Lindus; the Pallas of Attica, as a stake; Jupiter, in one place, as a rock; Apollo, as a triangle.

Together with Jupiter or Zeus, the Pelasgi worshipped Gaia or Mother Earth, in Athens, Sparta, Olympia, and other places. One of her names was Diônê; another was Rhea. In Asia she was Cybele; but everywhere she typified the great productive power of nature.

Another Pelasgic god was Hêlios, the Sun-God, worshipped with his sister Sêlêne, the Moon. The Pelasgi also adored the darker divinities of the lower world. At Pylos and Elis, the king of Hades was worshipped as the awful Aïdoneus; and Persephonê, his wife, was not the fair Kora of subsequent times, but the fearful Queen of Death, the murderess, homologous to the savage wife of Çiva, in the Hindoo Pantheon. To this age also belongs the worship of the Kabiri, nameless powers, perhaps of Phoenician origin, connected with the worship of fire in Lemnos and Samothrace.

The Doric race, the second great source of the Hellenic family, entered Greece many hundreds of years after[221] the first great Pelasgic migration had spread itself through Asia Minor, Greece, and Italy. It brought with it another class of gods and a different tone of worship. Their principal deities were Apollo and Artemis, though with these they also worshipped, as secondary deities, the Pelasgic gods whose homes they had invaded. The chief difference between the Pelasgic and Dorian conception of religion was, that with the first it was more emotional, with the second more moral; the first was a mystic natural religion, the second an intellectual human religion. Ottfried Müller[222] says that the Dorian piety was strong, cheerful, and bright. They worshipped Daylight and Moonlight, while the Pelasgians also reverenced Night, Darkness, and Storm. Funeral solemnities and enthusiastic orgies did not suit the Dorian character. The Spartans had no splendid processions like the Athenians, but they prayed the gods "to give them what was honorable and good"; and Zeus Ammon declared that the "calm solemnity of the prayers of the Spartans was dearer to him than all the sacrifices of the Greeks."[223]

Two facts are to be noticed in connection with this primitive religion. One is the local distribution of the different deities and modes of worship through Greece. Every tribe had its own god and its own worship. In one place it was Zeus and Gaia; in another, Zeus and Cybele; in a third, Apollo and Artemis. At Samothrace prevailed the worship of the Heaven and the Earth.[224] Dione was worshipped with Zeus at Dodona.[225] The Ionians were devoted to Poseidôn, god of the sea. In Arcadia, Athênê was worshipped as Tritonia. Hermês was adored on Mount Cyllene; Erôs, in Boeotia; Pan, in Arcadia. These local deities long remained as secondary gods, after the Pan-Hellenic worship of Olympus had overthrown their supremacy. But one peculiarity of the Pre-Homeric religion was, that it consisted in the adoration of different gods in different places. The religion of Hellas, after Homer, was the worship of the twelve great deities united on Mount Olympus.

The second fact to be observed in this early mythology is the change of name and of character through which each deity proceeds. Zeus alone retains the same name from the first.[226]