Tuatha Dé Danaan
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Tu·a·tha Dé Da·naan(to͞o′ə-hə dā′ dä′nən)
The pre-Christian gods who invaded and inhabited Ireland, sometimes represented as heroes or fairies. They were defeated by the Milesians and driven underground.
[Middle Irish Túatha Dé Danann (traditionally interpreted as meaning "Tribes of the goddess Danu" ), from Old Irish Túatha Dé Donann : tuatha, pl. of túath, people, tribe + dé : genitive of día, god, goddess + Donann, of unknown origin.]