Panhellenic cults
The major center where all Greeks converged to pay honor to their chief god was Olympia. Their quadrennial festival featured the famous Games. There was also an altar to Zeus made not of stone, but of ash, from the accumulated remains of many centuries' worth of animals sacrificed there.
Outside of the major inter-polis sanctuaries, there were no modes of worshipping Zeus precisely shared across the Greek world. Most of the titles listed below, for instance, could be found at any number of Greek temples from Asia Minor to Sicily. Certain modes of ritual were held in common as well: sacrificing a white animal over a raised altar, for instance.
With one exception, Greeks were unanimous in recognizing the birthplace of Zeus as Crete. Minoan culture contributed many essentials of ancient Greek religion: "by a hundred channels the old civilization emptied itself into the new", Will Durant observed, and Cretan Zeus retained his youthful Minoan features. The local child of the Great Mother, "a small and inferior deity who took the roles of son and consort", whose Minoan name the Greeks Hellenized as Velchanos, was in time assumed as an epithet by Zeus, as transpired at many other sites, and he came to be venerated in Crete as Zeus Velchanos ("boy-Zeus"), often simply the Kouros.
In Crete, Zeus was worshipped at a number of caves at Knossos, Ida and Palaikastro. In the Hellenistic period a small sanctuary dedicated to Zeus Velchanos was founded at the Hagia Triada site of an earlier Minoan town. Broadly contemporary coins from Phaistos show the form under which he was worshiped: a youth sits among the branches of a tree, with a cockerel on his knees. On other Cretan coins Velchanos is represented as an eagle and in association with a goddess celebrating a mystic marriage. Inscriptions at Gortyn and Lyttos record a Velchania festival, showing that Velchanios was still widely venerated in Hellenistic Crete.
The stories of Minos and Epimenides suggest that these caves were once used for incubatory divination by kings and priests. The dramatic setting of Plato's Laws is along the pilgrimage-route to one such site, emphasizing archaic Cretan knowledge. On Crete, Zeus was represented in art as a long-haired youth rather than a mature adult and hymned as ho megas kouros, "the great youth". Ivory statuettes of the "Divine Boy" were unearthed near the Labyrinth at Knossos by Sir Arthur Evans. With the Kouretes, a band of ecstatic armed dancers, he presided over the rigorous military-athletic training and secret rites of the Cretan paideia.
The myth of the death of Cretan Zeus, localised in numerous mountain sites though only mentioned in a comparatively late source, Callimachus, together with the assertion of Antoninus Liberalis that a fire shone forth annually from the birth-cave the infant shared with a mythic swarm of bees, suggests that Velchanos had been an annual vegetative spirit.
The Hellenistic writer Euhemerus apparently proposed a theory that Zeus had actually been a great king of Crete and that posthumously, his glory had slowly turned him into a deity. The works of Euhemerus himself have not survived, but Christian patristic writers took up the suggestion.
The epithet Zeus Lykaios (Λύκαιος; "wolf-Zeus") is assumed by Zeus only in connection with the archaic festival of the Lykaia on the slopes of Mount Lykaion ("Wolf Mountain"), the tallest peak in rustic Arcadia; Zeus had only a formal connection with the rituals and myths of this primitive rite of passage with an ancient threat of cannibalism and the possibility of a werewolf transformation for the ephebes who were the participants. Near the ancient ash-heap where the sacrifices took place was a forbidden precinct in which, allegedly, no shadows were ever cast.
According to Plato, a particular clan would gather on the mountain to make a sacrifice every nine years to Zeus Lykaios, and a single morsel of human entrails would be intermingled with the animal's. Whoever ate the human flesh was said to turn into a wolf, and could only regain human form if he did not eat again of human flesh until the next nine-year cycle had ended. There were games associated with the Lykaia, removed in the fourth century to the first urbanization of Arcadia, Megalopolis; there the major temple was dedicated to Zeus Lykaios.
There is, however, the crucial detail that Lykaios or Lykeios (epithets of Zeus and Apollo) may derive from Proto-Greek *λύκη, "light", a noun still attested in compounds such as ἀμφιλύκη, "twilight", λυκάβας, "year" (lit. 'light's course") etc. This, Cook argues, brings indeed much new 'light' to the matter as Achaeus, the contemporary tragedian of Sophocles, spoke of Zeus Lykaios as "starry-eyed", and this Zeus Lykaios may just be the Arcadian Zeus, son of Aether, described by Cicero. Again under this new signification may be seen Pausanias's descriptions of Lykosoura being 'the first city that ever the sun beheld', and of the altar of Zeus, at the summit of Mount Lykaion, before which stood two columns bearing gilded eagles and 'facing the sun-rise'. Further Cook sees only the tale of Zeus's sacred precinct at Mount Lykaion allowing no shadows referring to Zeus as 'god of light' (Lykaios).
Although etymology indicates that Zeus was originally a sky god, many Greek cities honored a local Zeus who lived underground. Athenians and Sicilians honored Zeus Meilichios (Μειλίχιος; "kindly" or "honeyed") while other cities had Zeus Chthonios ("earthy"), Zeus Katachthonios (Καταχθόνιος; "under-the-earth") and Zeus Plousios ("wealth-bringing"). These deities might be represented as snakes or in human form in visual art, or, for emphasis as both together in one image. They also received offerings of black animal victims sacrificed into sunken pits, as did chthonic deities like Persephone and Demeter, and also the heroes at their tombs. Olympian gods, by contrast, usually received white victims sacrificed upon raised altars.
In some cases, cities were not entirely sure whether the daimon to whom they sacrificed was a hero or an underground Zeus. Thus the shrine at Lebadaea in Boeotia might belong to the hero Trophonius or to Zeus Trephonius ("the nurturing"), depending on whether you believe Pausanias, or Strabo. The hero Amphiaraus was honored as Zeus Amphiaraus at Oropus outside of Thebes, and the Spartans even had a shrine to Zeus Agamemnon. Ancient Molossian kings sacrificed to Zeus Areius (Αρειος). Strabo mention that at Tralles there was the Zeus Larisaeus (Λαρισαιος). In Ithome, they honored the Zeus Ithomatas, they had a sanctuary and a statue of Zeus and also held an annual festival in honour of Zeus which was called Ithomaea (ἰθώμαια).
Hecatomphonia (Ancient Greek: ἑκατομφόνια), meaning killing of a hundred, from ἑκατόν "a hundred" and φονεύω "to kill". It was a custom of Messenians, at which they offered sacrifice to Zeus when any of them had killed a hundred enemies. Aristomenes have offered three times this sacrifice at the Messenian wars against Sparta.
