Manawydan Son of Llŷr is a character from Welsh mythology, featured prominently in the Mabinogion, a collection of medieval Welsh tales. He is known as a skilled warrior and a master of magic, often associated with the sea and its mysteries. Manawydan is the son of Llŷr, a figure linked to the ocean, and he plays a significant role in various stories, showcasing themes of loyalty and adventure. In the tales, Manawydan embarks on quests that often involve challenges and transformations. He is particularly noted for his connection to Bran the Blessed and his efforts to protect his family and homeland. His narratives reflect the rich tapestry of Celtic mythology and the importance of kinship and resilience.