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.
Hera
Hera is the daughter of the youngest Titan Cronus and his wife, and sister, Rhea. Cronus was fated to be overthrown by one of his children; to prevent this, he swallowed all of his newborn children whole until Rhea tricked him into swallowing a stone instead of her youngest child, Zeus. Zeus grew up in secret and when he grew up he tricked his father into regurgitating his siblings, including Hera. Zeus then led the revolt against the Titans, banished them, and divided the dominion over the world with his brothers Poseidon and Hades.