Arianrhod

Arianrhod is the Celtic Moon-Mother Goddess who was known throughout the land for her stunning beauty.
She was the daughter of the Mother Goddess Don and her consort Beli.

She is ruler of Caer Sidi, a magical realm in the north. She was worshiped as priestess of the moon. The benevolent silver sky-lady came down from her pale white chariot in the heavens to watch more closely over the tides she ruled. Her Festival is on 2nd December, she is also honoured at the Full Moon.

A star and moon Goddess, Arianrhod was also called the Silver Wheel because the dead were carried on her Oar Wheel to Emania (the Moon-land or land of death), which belonged to her as a deity of reincarnation and karma. Her consort Nwyvre 'Sky, Space, Firmament' has survived in name only. Caer Arianrhod is the circumpolar stars, to which souls withdraw between incarnations, thus she is identified as a Goddess of reincarnation. The Mother aspect of the Triple Goddess in Wales, her palace was Caer Arianrhod (Aurora Borealis), or the secret center of each initiate's spiritual being.

And here is her story....

Arianrhod is the daughter of the Welsh Goddess Don and the sister of Gwydion. Gwydion was counselor to King Math who could only remain alive if his feet lay in the lap of a virgin at all times except when he led his armies into battle. During one such battle the virgin who had held King Math's feet was raped, and so there was need for a replacement. Gwydion recommended his sister, Arianrhod. King Math put her virginity to the test by asking her to step over his magic wand. As she stepped over the wand she gave birth to a boy child with yellow hair. The child cried loudly, and Arianrhod, humiliated, ran for the door, dropping yet another small object on the ground in the process. Before anyone could catch a glance at the object, Gwydion wrapped it and hid it inside a chest. King Math then performed rites for the yellow haired boy child, naming him Dylan. Dylan immediately ran for the sea and received the sea's nature and was never seen again.
A time later Gwydion presented Arianrhod with the object that he had hidden in the chest - a second boy child. Arianrhod was outraged at the "evidence" of her humiliation at the hands of King Math and rejected the child.
She laid on him three curses:
He shall have no name except one she gives him.
He shall bear no arms except ones she gives him.
He shall have no wife of the race that is now on the earth.
Gwydion was outraged by these curses and worked to break them. He disguised himself and the boy child as shoemakers and traveled to Caer Arianrhod. When Arianrhod went to have shoes fitted, the boy child threw a stone at a bird and deftly hit it. Arianrhod commented on the child's skillful hand. At that Gwydion revealed himself and the child and stated that she had just named him - Llew Llaw Gyffes, the Shining Skillful Hand. This threw Arianrhod into a firey rage and she stormed back to Caer Arianrhod swearing that the boy would never bear arms or have a human wife.
Again Gwydion tricked Arianrhod into breaking her own curse. He disguised himself and Llew as travelers and sought refuge in Caer Arianrhod. While they were there Gwydion caused an illusion showing a powerful armada of ships advancing on Caer Arianrhod. Making ready for battle Arianrhod threw open her armory and armed her retainers. Gwydion suggested to Arianrhod that she give arms to him and Llew (still in disguise) and they would fight at the defense of the castle. She readily agreed and thereby, unwittingly, granted arms to her son, breaking the second curse. Gwydion then revealed themselves to Arianrhod and told her that she may as well take the arms back from her son, as there really was no battle to be fought.
Enraged at being tricked a second time, Arianrhod took comfort in her third curse - that Llew would have no human wife. Gwydion, upset at the cruelty Arianrhod was showing her son, vowed to break this curse also. Gwydion went to King Math and explained Llew's plight. Combining their magic they created a woman made of flowers, Blodeuwedd, to be wife to Llew, and broke Arianrhod's third curse.
Humiliated by King Math, thwarted by her son, forsaken by her brother, Arianrhod retreated to her castle Caer Arianrhod. Here she later drowned when the sea reclaimed the land.

The poem is taken from the book "Ceridwen's Cauldron" by Gwdihw.
Lady Arianrhod
Arianrhod, Lady Fair
Fly over your caer, in the air
Served by the moth and the wren
The bat, bee and hidden men
Mother of Dylan, you did reign
You did not give his twin a name.
Your brother Gwydion sold you shoes
Your curse he made you quickly lose.
With a sling you saw your son
Lleu Llaw Gyffes, the fair one.
Arianrhod, Queen of the night
Refused arms for Lleu to fight.
When Math made ships out of mist
Lleu found a spear within his fist,
Her final curse forbade a bride
He found a flower maid by his side.
Gronw speared Lleu in the bowel,
Blodeuwedd changed from bride to owl
Arianrhod watched, high above
Giving Lleu both grief and love.
Binding him by silver thread
Thinking that he lay there dead.
Transformations took place
Feather grew from Lleu's face.
Gwydion changed him back to man
Healing him as magic can.
Arianrhod, Lady of the Wheel,
Reincarnator, help us heal.