This name derives from the Welsh adjective "llwyd", most often understood as meaning “grey, brown”, but with other meanings as well. The name can be used both as a personal name and as a surname. Llwyd ap Cil Coed is a character in the Third Branch of The Mabinogi, known also as the story of Manawydan ap Llŷr. Llwyd is a friend of Gwawl ap Clud, who had been insulted by Pwyll in the First Branch. Llwyd decides to avenge this insult upon Pryderi son of Pwyll by making barren and empty the kingdom of Dyfed. Later, by means of an enchanted bowl in a mysterious fortress, he imprisons Pryderi and Rhiannon, Pwyll's widow and Pryderi's mother. Llwyd apparently makes Rhiannon bear the yokes of his horses, while Pryderi had to carry the gate hammers, while they are in captivity.