The White Bull
The story is based on the Greek mythological tale of Europa and the bull, where the white bull is the king of the Greek gods, Zeus, in disguise. Zeus, the sky and thunder god of the Olympic pantheon, often wore a disguise when romantically pursuing mortal women, so as to avoid the eye of his wife and sister, Hera.
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.