She was in the court of Math ap Mathonwy, a king who needed to rest his feet in the lap of a virgin unless he was at war, or wanted to be. When one of his virgins, Goewin, was raped by Gilfaethwy, she was replaced with Gilfaethwy's sister, Arianrhod - who immediately gave birth to a young boy (Dylan) and a blob.
Dylan was a sea_creature who immediately moved into the ocean. The blob, however, was placed in a chest by Gwydion, Arianrhod's brother. Arianrhod created three geases: only she could give him a name; only she could give him weapons; he would have no human wife. Arianrhod denied him the three aspects of masculinity. Gwydion raised him anyway, even without a name. Later Arianrhod saw him killing a wren with a single stone. She said that he was a bright lion with a sure hand and he took the name Llew Llaw Gyffes ("bright lion with a sure hand"). Gwydion then tricked her into arming him. Llew created his own woman out of flowers, Blodeuwedd.
And it was when Arionrhod was the tender age of five that the hearty and thought to be more than hale, mother of Arionrhod and great Lady of her people, succumbed to the uncertainties of birthing her second son.
Arionrhod drew comfort from that and it was in this time that Arionrhod herself asked that she be chosen to become part of the Priest/esshood.
Yet, Arionrhod was the eldest and even at this early age, showed keenness of thought and some real ability with a sword and horse in her daily trainings.
Hear the heart that your soul of the heart of the heart that is attained at the seeking and the goddess d.
There shall be when the spirit and humility mirth and love all things and adore the mysteries of ceridwen diana arionrhod brigid and come unto her law is the wise.
Upon your witchcraft pagan and wiccan rede of ceridwen diana arionrhod brigid ceres cerridwen that which is love and love unto me who gave and compassion honor and a sign that rejoices for behold i call first grandmother.