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.
The Order of the Stick
There once was a fourth primary pantheon, the Eastern Pantheon, based on the Greek pantheon led by Zeus. These deities were killed by the Snarl and so had no role in the re-creation of the world; only people who are privy to the story of the Snarl have ever even heard of them.