Rhiannon is a figure from Welsh mythology, often associated with horses and the moon. She is known as a goddess or fairy queen and is featured prominently in the Mabinogi, a collection of medieval Welsh tales. Rhiannon is depicted as a beautiful and powerful woman, often riding a white horse and possessing magical abilities. In the stories, Rhiannon faces various challenges, including being wrongfully accused of a crime. She is a symbol of strength and resilience, representing themes of love, loyalty, and transformation. Rhiannon's character has inspired various adaptations in literature and art, highlighting her enduring legacy in Celtic culture.