Apollo is the Greek god of music and the sun, and is Artemis' twin brother. His statue appears in Mythology Island.
Role in Mythology Island
To lull Cerberus to sleep, you need to go into Apollo's Temple and get a flute. You must go to the muse with the flute and pass her test to get the tune to play to put Cerberus asleep. His statue is also seen in the Museum, next to Hestia's.