Llyr is a figure from Welsh mythology, often associated with the sea and water. He is considered a god or a powerful being, and his name is linked to the word for "ocean" in the Welsh language. Llyr is the father of several notable characters, including Bran the Blessed and Manawydan, who play significant roles in various myths. In the Mabinogion, a collection of Welsh tales, Llyr's story highlights themes of loss and transformation. His character embodies the connection between humanity and the natural world, particularly the mysteries of the sea. Llyr's legacy continues to influence Celtic literature and modern interpretations of mythology.