Goddesses of The Celts ~ O-R

Olwen
Olwen "white track", probably for flowers that blossomed under her feet) was the daughter of the Ysbaddaden, a monstrous figure whose life depended on keeping his daughter. She was a beautiful woman of high degree. When she married, her father's power (and life) was transferred to her husband.

Onagh
A queen of the Irish fairies.

Rhiannon
(Wales) She left her home in the land of fairie for love. When she began existence on this earthly plain, she lost most of her otherworldly powers but can still send magic to those around her, even in times of great distress. The Other World Birch Goddess, Raven is her bird.
Wife of Pwyll, mother of Pryderi. Unjustly accused of destroying her newborn son (who had been kidnapped by a nameless Fiend). She is compelled to take on the role of a horse, until her son is unexpectedly returned to her. She is considered as an aspect of the Gaulish Epona, and the Irish Morrigan. She was mistress of the Singing Birds. She appeared to Pwyll, lord of Dyfed, as a beautiful woman in dazzling gold on a white horse. Pwyll sent his fastest horsmen after her, but could not catch her. On the third day, he spoke and she told him she wanted to marry instead of her espoused husband Gwawl. Pywll was to meet her in a year and a day.
He won her at the court of her father, Hefeydd the Old, by her aid. She bore Pwyll a son, who vanished. Her women killed a puppy and smeared its blood on her, to avoid blame at the child's loss. As punishment, Rhiannon spent seven years telling her story to all comers and bearing them, like a horse, to the court.
The child, meanwhile, turned up at the court of Teyrnon, whose mares foaled on May eve and lost the foals mysteriously. When Teirnon kept watch, he saved a foal from a mysterious beast and also discovered, outside the stable, a child, whom he and his wife adopted. Then child grew to young manhood in seven years, and was given the foal rescued on the night he was found. Teirnon recognised the child as the son of Pwyll and returned him to his family, where he was named Pryderi ("worry") by his mother.
Later, after Pwyll's death, Rhiannon married Manawydan, brother of Bran and Branwen and son of Llyr, a great magician. One day, all of Dyfed turned into a wasteland, and only Rhiannon, Manawydan, Pryderi, and his wife Cigfa, were spared. Manawydan and Pryderi out hunting followed an enormous white boar into a caer, where Pryderi saw a golden bowl; when he touched it, he was enspelled. Rhiannon went after him and fell under the same spell the caer then vanished, taking them with it. She was rescued when Manawydan captured the wife of their enemy, Llwyd, who was taking revenge for the illtreatment of Gwawl.