Manawydan fab Llŷr, a figure of Welsh mythology, is prominently featured in the Mabinogi, specifically in the Second and Third Branches. In the Second Branch, Manawydan serves as an advisor to his brother, Brân the Blessed, King of Britain. He plays a key role in the rescue mission for their mistreated sister, Branwen, after she is married off to Matholwch, King of Ireland. Manawydan is one of the seven survivors of the devastating war that follows, during which Brân is mortally wounded. Manawydan and the others take Brân’s severed head to the White Hill, where it serves as a talisman against foreign invasion. In the Third Branch, Manawydan becomes closely involved in the struggles of Dyfed. He settles in Dyfed with his friend Pryderi and Pryderi’s family after returning from Ireland. However, a curse causes the land to become barren and the people to disappear, leaving only Manawydan, Pryderi, his wife Cigfa, and Rhiannon. They move to England but are forced to return to Dyfed after facing jealousy and hostility. Manawydan eventually discovers the cause of the curse and defeats the enchanter responsible, Llwyd ap Cil Coed, thereby restoring prosperity to Dyfed and rescuing Rhiannon and Pryderi. In addition to his appearances in the Mabinogi, Manawydan is mentioned in other Welsh medieval literature and poetry, where he is portrayed as a brave warrior and advisor to King Arthur. He is also referenced in Trioedd Ynys Prydein and Y Gododdin, highlighting his significance in Welsh tradition and mythology.