…about long hunting parties after the milk-white stag who could give you wishes if you caught him; about feasting and treasure-seeking with the wild Red Dwarfs in deep mines and caverns far beneath the forest floor; and then about summer when the woods were green and old Silenus on his fat donkey would come to visit them, and sometimes Bacchus himself, and then the streams would run with wine instead of water and the whole forest would give itself up to jollification for weeks on end.
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Dionysus is the Greek counterpart to the better known Roman Bacchus.
The boy with the wild face is Bacchus...
C.S. Lewis -- Prince Caspian: The Return to Narnia