The story of the Llyr group is told in the Mabinogion of Branwen and of Manawyddan. They are associated with the Pwyll group, and apparently opposed to that of Dôn. Branwen is married to Matholwych, king of Ireland, but is ill-treated by him on account of the insults of the mischievous Evnissyen, in spite of the fact that Bran had atoned for the insult by many gifts, including that of a cauldron of regeneration. Now he crosses with an army to Ireland, where Evnissyen throws Branwen's child, to whom the kingdom is given, on the fire. A fight ensues; the dead Irish warriors are resuscitated in the cauldron, but Evnissyen, at the cost of his life, destroys it. Bran is slain, and by his directions his head is cut off and carried first to Harlech, then to Gwales, where it will entertain its bearers for eighty years. At the end of that time it is to be taken to London and buried. Branwen, departing with the bearers, dies of a broken heart at Anglesey, and meanwhile Caswallyn, son of Beli, seizes the kingdom.286 Two of the bearers of the head are Manawyddan and Pryderi, whose fortunes we follow in the Mabinogi of the former. Pryderi gives his mother Rhiannon to Manawyddan as his wife, along with some land which by magic art is made barren. After following different crafts, they are led by a boar to a strange castle, where Rhiannon and Pryderi disappear along with the building. Manawyddan, with Pryderi's wife Kieva, set out as shoemakers, but are forced to abandon this craft on account of the envy of the craftsmen. Finally, we learn how Manawyddan overcame the enchanter Llwyt, who, because of an insult offered by Pryderi's father to his friend Gwawl, had made Rhiannon and Pryderi disappear. They are now restored, and Llwyt seeks no further revenge.
The story of Branwen is similar to a tale of which there are variants in Teutonic and Scandinavian sagas, but the resemblance is closer to the latter.287 Possibly a similar story with their respective divinities or heroes for its characters existed among Celts, Teutons, and Norsemen, but more likely it was borrowed from Norsemen who occupied both sides of the Irish Sea in the ninth and tenth century, and then naturalised by furnishing it with Celtic characters. But into this framework many native elements were set, and we may therefore scrutinise the story for Celtic mythical elements utilised by its redactor, who probably did not strip its Celtic personages of their earlier divine attributes. In the two Mabinogi these personages are Llyr, his sons Bran and Manawyddan, his daughter Branwen, their half-brothers Nissyen and Evnissyen, sons of Llyr's wife Penardim, daughter of Beli, by a previous marriage with Eurosswyd.
Llyr is the equivalent of the Irish Ler, the sea-god, but two other Llyrs, probably duplicates of himself, are known to Welsh story—Llyr Marini, and the Llyr, father of Cordelia, of the chroniclers.288 He is constantly confused with Lludd Llawereint, e.g. both are described as one of three notable prisoners of Britain, and both are called fathers of Cordelia or Creiddylad.289 Perhaps the two were once identical, for Manannan is sometimes called son of Alloid (= Lludd), in Irish texts, as well as son of Ler.290 But the confusion may be accidental, nor is it certain that Nodons or Lludd was a sea-god. Llyr's prison was that of Eurosswyd,291 whose wife he may have abducted and hence suffered imprisonment. In the Black Book of Caermarthen Bran is called son of Y Werydd or "Ocean," according to M. Loth's interpretation of the name, which would thus point to Llyr's position as a sea-god. But this is contested by Professor Rh^ys who makes Ywerit wife of Llyr, the name being in his view a form of the Welsh word for Ireland. In Geoffrey and the chroniclers Llyr becomes a king of Britain whose history and that of his daughters was immortalised by Shakespeare. Geoffrey also refers to Llyr's burial in a vault built in honour of Janus.292 On this Professor Rh^ys builds a theory that Llyr was a form of the Celtic Dis with two faces and ruler of a world of darkness.293 But there is no evidence that the Celtic Dispater was lord of a gloomy underworld, and it is best to regard Llyr as a sea-divinity.
Manawyddan is not god-like in these tales in the sense in which the majestic Manannan of Irish story is, though elsewhere we learn that "deep was his counsel."294 Though not a magician, he baffles one of the great wizards of Welsh story,