In Celtic Tradition

MABON was the young son of Mother Modron. Throughout the world there was not a huntsman who could hunt with the dog Drudwyn, the whelp of Greid, the son of Eri, except for Mabon the son of Modron. He was taken from his mother when three nights old, and it was not known where he was, nor whether he were living or dead.
Gwynn Mygdwn, the horse of Gweddw, that was as swift as the wave, carried Mabon the son of Modron to hunt the boar Twrch Trwyth.
Mabon could not be sought for it was not known where he was unless Eidoel, his cousin kinsman in blood, the son of Aer, was found.
The whereabouts of Mabon son of Modron who was taken away at three nights old from his mother were known only to the Salmon of Llyn Llyw. In Gloucester it was that Mabon the son of Modron was imprisoned; and no imprisonment was ever so grievous as that of Mabon, neither that of Lludd Llaw Ereint, nor that of Greid the son of Eri.
Arthur summoned the warriors of the Island, and they journeyed as far as Gloucester, to the place where Mabon was in prison. Kai and Bedwyr went upon the shoulders of the fish, whilst the warriors of Arthur attacked the castle. And Kai broke through the wall into the dungeon, and brought away the prisoner upon his back, whilst the fight was going on between the warriors. And Arthur returned home, and Mabon with him at liberty.
And after that Arthur went into Armorica, and with him Mabon the son of Mellt, and Gware Gwallt Euryn, to seek the two dogs of Glythmyr Ledewic. And when he had got them, he went to the West of Ireland, in search of Gwrgi Severi; and Odgar the son of Aedd king of Ireland, went with him. And thence went Arthur into the North, and captured Kyledyr Wyllt; and he went after Yskithyrwyn Benbaedd. And Mabon the son of Mellt came with the two dogs of Glythmyr Ledewic in his hand, and Drudwyn, the cub of Greid the son of Eri. And Arthur went himself to the chase, leading his own dog Cavall.
Mabon the son of Modron, came up with Arthur at the Severn, upon Gwynn Mygddon, the horse of Gweddw, and Goreu the son of Custennin, and Menw the son of Teirgwaedd; this was betwixt Llyn Lliwan and Aber Gwy. And Arthur fell upon Twrch Trwyth together with the champions of Britain. And Osla Kyllellvawr drew near, and Manawyddan the son of Llyr, and Kacmwri the servant of Arthur, and Gwyngelli, and they seized hold of him, catching him first by his feet, and plunged him in the Severn, so that it overwhelmed him. On the one side, Mabon the son of Modron spurred his steed and snatched his razor from him, and Kyledyr Wyllt came up with him on the other side, upon another steed, in the Severn, and took from him the scissors.