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.
Dionysus
In the Greek pantheon, Dionysus (along with Zeus) absorbs the role of Sabazios, a Thracian/Phrygian deity. In the Roman pantheon, Sabazius became an alternative name for Bacchus.