The term 'Celtic Goddess' refers to three deities from Celtic mythology: DRUID, ERSE, and Danu. DRUID is a god of wisdom, knowledge, and magic, while ERSE is the goddess of the earth and fertility. Danu is the mother goddess of the Tuatha De Danann, a race of supernatural beings in Irish mythology. All three of these gods are associated with the Celts, an ancient Indo-European people who lived in parts of Europe and the British Isles.