Geography/Culture: Celtic: Irish. She is one of the Tuatha de Danaan, 'People of the Goddess Danu'. Latitude: 51 54 N - Longitude: 8 30 W (of Cork). Her residence is the sidh of Bri Leith, now called Slieve Golry, near Ardagh in Munster. She is mentioned in a ninth century A.D. original manuscript.
Linguistic Note: The language of origin is Irish Gaelic. (The pronunciation of Her name as rendered above is as I've lately discovered incorrect. The T should definitely be D, the whole perhaps: ADINY. The major revision of Her Cycle that such a change would entail is not planned till about 2000.)
Description: Shapeshifting Triple Goddess of the sun, water, beauty, fragrance, music and the transmigration of souls; Loveliest of maidens; Bestower of sovereignty; She Who warns against deception; She Who lives in a griane, a house open to the sun; She Who most easily fits into the congenial company of The Land of Women.
To Whom Sacred: swan (in which form She flys with Midhir); mare; the color purple; the number 7 (the number of years She remained in the form of the fly after which, having been swallowed by a certain woman, She was reborn in a mortal form and given Her own name); jeweled goblet (which She hands the king as the symbolical act of marriage); crystal sun-bower (in which She lived in Her fly form).
Transformations: pool of water, which turns into a worm which turns into a purple fly of great size and radiant beauty which fills the air with music and fragrance.
Festival: the Feast of Tara (date unknown) during which the marriage of mortal king and Goddess was ritually re-enacted. (The Goddess signifies the land to which the king is married.)
Male Associates: consort, Midhir, god of the underworld, from whom She was abducted by Angus, god of love. In one of Her mortal aspects She was the Queen of Eochaid Airem, Eochaid-the-Ploughman, a king of Ireland who reigned at Tara.

Titles/Variants, etc:
• She is one of the fairy folk, and might also be known as Bean-Sidhe, Woman-of-the-Fairy-Mounds.
• Mother of Irish Blathnat, Little-Flower, Who is linked with Welsh Olwen, She-of-the-White-Track.
• Title: Echraidhe, Horse-Riding.
• Variant: Edain, {perhaps more phonetically accurate but not the Irish orthography!}
• As mortal Queen of Eochaid, She is Mother of Her Daughter self: Etain, Shining-One.
• Variant: Étain.
• Perhaps a variant: Etan, but see below.
• Her 'Horse-Riding' title suggests a possible connection not only with the Irish Goddesses Macha, Battle, and Aine, Queen, (Who is linked with Danu, She-of-Knowledge) but also with the European Celtic horse Goddess Epona, Divine-Mare.
• Her rival is: Fuamhnach, ----, below.
• She seems to be equivalent to the Welsh Triple Gwynhwyvar, White-Apparition, Who is linked with Elaine, Lily-Maid.
• Perhaps the Daughter of Madb, Boiling, (Who is linked with Macha, Battle), since Etain's father is Ailill.
• The Morrighan, Great-Queen, and Dagda perform an annual marriage, such as is performed at the Feast of Tara.

Geography/Culture: Celtic: Irish.
Male Associates: son, Cairpre, bard of the Tuatha De Danann, by congenitor Ogma, Sun-Face, (also called Cermait, Honey-Mouthed), god of eloquence and literature. Daughter of Diancecht, God-of-Health. {I can't find a name for Her Mother}. Ogma, Etan's consort, and Midhir, Etain's consort and Angus, Etain's abductor, are all brothers.

Titles/Variants, etc:
• Perhaps a variant of Etain, Shining-One, above.
• Variant: Étain.

Geography/Culture: Irish Celtic.
Description: Goddess of cunning and magic; Queen of the Fairies; She Who raises the wind.
To Whom Sacred: wand (She strikes Etain, with a rod, bringing about Her transformations).
Male Associate: consort, Midhir.

Titles/Variants, etc:
• Rival of Etain, Shining-One, above.
• Variant: Fuamnach.