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 his mother." "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 Kai and Gwrhyr Gwalstawt Ieithoedd went upon the two shoulders of
the salmon, and they proceeded until they came unto 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?" "Alas, there is reason enough for whoever is here to lament.
It is Mabon the son of Modron who is here imprisoned; and no
imprisonment was ever so grievous as mine, neither that of Llud Llaw
Ereint, nor that of Greid the son of Eri." "Hast thou hope of being
released for gold or for silver, or for any gifts of wealth, or
through battle and fighting?" "By fighting will whatever I may gain
be obtained."

Then they went thence, and returned to Arthur, and they told him
where Mabon the son of Modron was imprisoned. And 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.