Zeus
Zeus played a dominant role, presiding over the Greek Olympian pantheon. He fathered many of the heroes and was featured in many of their local cults. Though the Homeric "cloud collector" was the god of the sky and thunder like his Near-Eastern counterparts, he was also the supreme cultural artifact; in some senses, he was the embodiment of Greek religious beliefs and the archetypal Greek deity.
Zeus
The oracle of Ammon at the Siwa Oasis in the Western Desert of Egypt did not lie within the bounds of the Greek world before Alexander's day, but it already loomed large in the Greek mind during the archaic era: Herodotus mentions consultations with Zeus Ammon in his account of the Persian War. Zeus Ammon was especially favored at Sparta, where a temple to him existed by the time of the Peloponnesian War.