The wooing of Olwen
After that I went with my whole kindred to attack him and to try to destroy him, but he sent messengers and made peace with me, and came and besought me to take fifty fish-spears out of his back. Unless he know something of him whom you seek, I cannot tell you who may. However, I will guide you to the place where he is."
So they went thither, and the eagle said, "Salmon of Llyn Llyw, I have come to thee with an embassy from Arthur to ask thee if thou knowest aught concerning Mabon, the son of Modron, who was taken away at three nights old from between his mother and the wall."
And the salmon answered, "As much as I know I will tell thee. With every tide I go along the river upwards, until I come near to the walls of Gloucester, and there have I found such wrong as I never found elsewhere; and to the end that ye may give credence thereto, let one of you go thither upon each of my two shoulders."
So Kay and Gwrhyr went upon his shoulders, and they proceeded till they came to the wall of the prison, and they heard a great wailing and lamenting from the dungeon. Said Gwrhyr, "Who is it that laments in this house of stone?"
And the voice replied, "Alas, it is Mabon, the son of Modron, who is here imprisoned!"
Then they returned and told Arthur, who, summoning his warriors, attacked the castle.
And whilst the fight was going on, Kay and Bedwyr, mounting on the shoulders of the fish, broke into the dungeon, and brought away with them Mabon, the son of Modron.
Then Arthur summoned unto him all the warriors that were in the three islands of Britain and in the three islands adjacent; and he went as far as Esgeir Ocrvel in Ireland where the Boar Truith was with his seven young pigs. And the dogs were let loose upon him from all sides. But he wasted the fifth part of Ireland, and then set forth through the sea to Wales. Arthur and his hosts, and his horses, and his dogs followed hard after him. But ever and awhile the boar made a stand, and many a champion of Arthur's did he slay.