Danu, Anu, or Dana is the acient Goddess Mother or Ireland. The Welsh Don is her equivalant. She is the Goddess worshipped by the Sidhe race, the  Tuatha de Dannan. Some people believe that the Goddess Diana, the Fairy queen of witcheries derived from the great Danu.
Morgan Le Fey, or Morgan of the Fairies was Arthur' s half sister. She was a Priestess of Avalon where she was raised and tutored in the magickal arts. She may have been a lover of Marlin, who taught her many skills. Morgan means "of the sea" which may refer to her Avalonian home across the waters. Morgan Le Fey was a seductive enchantress, a wild woman of Fairie.
Nimue is the otherworls Goddess, sometimes known as the Lady of the Lake. The Lady of the Lake appears throught the Arthurian legends as a mysterious figure that offers advice and intervention. It is thought that a number of Goddesses have assumed this role, including Morgan Le Fey and Vivienne, as well as Nimue. In some versions of the legend Nimue turns against the aging Merlyn and trapped him in her crystal cave. Some believe she only kept him there for safety and healing until the people of the Earth invoked his return.
Gwenhwyar whose name means White Spirit, is the original May Queen of
Faery. It is said that she wed King Arthur on Beltaine , or May Day, a month
reserved for the marriage of the Gods. Whoever bedded Gwenhwyfar ruled the
Land. Her grace and beauty were highly sought after and her love affair with
Sir Lancelot weakened the power of the idyllic Camelot
Medb, also known as Mab or Maeve, is the magnificent Warrior Queen of Faeries. According to Irish legend, as in the stories of Gwenhwyfar, no King could reign in this world unless he was married to this Queen of the Otherworld. In other words the King must have one foot in this world and one in the other. Her fierce invasion of Ulster precipitated her downfall. In revenge for this act, she was slain by the single slingshot of Forbai, son of the Ulster King, while she was bathing in a pool
Aine is a beautiful fertility Goddess of ancient Ireland. She has been called the Faery Queen of Knockaine. Wherever she focused her attention Love flourished. Aine's Hill in County Kerry, was the site of glorious Midsummer celebrations in her honor
Rhiannon, "The Great Queen", was cursed by a scorned lover's father. As a result she became barren and childless for many years. When at last she gave birth to her first son, she was falsely accused of devouring her child. She is seen riding a swift white steed accompanied by blackbirds. She is thepatroness of all unjustly accused and of those who suffer long-term hardships.
Blodeuedd is an Otherworldly woman who was born of flowers. Lleu's mother Arianrhod place a gais (magical oath) on her son that he should never marry a mortal woman. So Blodeuedd, whose name means "Flower Face", was created from the flowers of oak, broom and meadowsweet by powerful magicians as a wife for Lleu. When she slept with another man she was changed into an owl and became a creature of the night