Editing Rhiannon (section)

===''Y Mabinogi'': First Branch===
Rhiannon first appears at Gorsedd Arberth, an ancestral mound near one of the chief courts of [[Dyfed]]. [[Pwyll]], the prince of Dyfed, has accepted the challenge of the mound's magical tradition to show ''rywedawt''/ a marvel, or else deal out blows. Rhiannon appears to him and his court as the promised ''rywedawt''/ marvel. She is a beautiful woman arrayed in gold silk brocade, riding a shining ''canwelw''/ pale-white horse. Pwyll twice sends his best horsemen after her two days running, but she always remains ahead of them, though her horse never does more than amble. On the third day he finally follows her himself and does no better, until he finally appeals to her to stop for him.

Rhiannon characteristically rebukes him for not considering this course before, then explains she has sought him out to marry him, in preference to her current betrothed, [[Gwawl|Gwawl ap Clud]]. Pwyll gladly agrees, but at their wedding feast at her father's court, an unknown man requests Pwyll grant a request; which he does without asking what it is. The man is Gwawl, and he requests Rhiannon.

Rhiannon rebukes Pwyll a second time for his [[rash promise]], but provides the means and the plan to salvage the situation. She holds a second wedding feast for Gwawl, where she deploys Pwyll's men outside in the orchard. She instructs Pwyll to enter the hall dressed as a beggar and humbly request Gwawl fill a certain 'small bag' with food. But she has enchanted the 'small bag' so it cannot ever be filled by normal means. Gwawl is persuaded to step in it to control its magic, which means Pwyll can trap him in it. Pwyll's men rush in and surround the hall, then beat and kick Gwawl as the Badger-in-the-Bag game. To save his life Gwawl is forced to relinquish Rhiannon completely, and also his revenge. Rhiannon marries Pwyll, then journeys to Dyfed as its queen.

[[File:Pryderi and Rhiannon.jpg|thumb|Pryderi and Rhiannon's imprisonment, by Albert Herter. From  Thomas Wentworth Higginson's ''Tales of the Enchanted Islands of the Atlantic'']]

After a happy two years, Pwyll comes under pressure from his nobles, to provide an heir. He refuses to set Rhiannon aside as barren, and in the third year their son is born. However, on the night of his birth, the newborn disappears while in the care of Rhiannon's six sleepy maids. Terrified of being put to death, the women kill a puppy and smear its blood on Rhiannon's sleeping face. In the morning they accuse her of infanticide and cannibalism. Rhiannon takes counsel with her own advisers, and offers to undergo a penance. Pwyll is again urged to set her aside, but refuses, and sets her penance instead. She must sit every day by the gate of the castle at the horse block, to tell her story to travelers. She must also offer to carry them on her back as a beast of burden, though few accept this. However, as the end of the story shows, Pwyll maintains her state as his queen, as she still sits at his side in the hall at feasting time.

The newborn child is discovered by [[Teyrnon]], the lord of Gwent-Is-Coed (South-Eastern [[Wales]]). He is a horse lord whose fine mare foals every May Eve, but the foals go missing each year. He takes the mare into his house and sits vigil with her. After her foal is born he sees a monstrous claw trying to take the newborn foal through the window, so he slashes at the monster with his sword.  Rushing outside he finds the monster gone, and a human baby left by the door. He and his wife claim the boy as their own naming him Gwri Wallt Euryn (Gwri of the Golden Hair), for "all the hair on his head was as yellow as gold".<ref>''The Mabinogion.'' Davies, Sioned. 2005.</ref> The child grows at a superhuman pace with a great affinity for horses. Teyrnon who once served Pwyll as a courtier, recognises the boy's resemblance to his father. As an honourable man, he returns the boy to the Dyfed royal house.

Reunited with Rhiannon the child is formally named in the traditional way via his mother's first direct words to him {{lang|mga|[[Pryderi]]}} a wordplay on "delivered" and "worry", "care", or "loss". In due course Pwyll dies, and [[Pryderi]] rules Dyfed, marrying [[Cigfa]] of Gloucester, and amalgamating the seven cantrefs of [[Kingdom of Morgannwg|Morgannwg]] to his kingdom.