Pwyll, Prince of Dyfed, is a central figure in Welsh mythology, particularly in the collection known as the Mabinogion. He is known for his adventures and encounters with the supernatural, including his meeting with Arawn, the king of the Otherworld. Pwyll's story highlights themes of honor, friendship, and the complexities of fate. In his tale, Pwyll exchanges places with Arawn for a year, allowing him to experience the Otherworld. His actions lead to the eventual union with Rhiannon, a beautiful and enigmatic figure, further intertwining his fate with the magical elements of Welsh lore.