Math, son of Mathonwy
So he and Gilvaethwy went, and ten other men with them. And they came into Ceredigiawn, to the place that is now called Rhuddlan Teivi, where the palace of Pryderi was. In the guise of bards they came in, and they were received joyfully, and Gwydion was placed beside Pryderi that night.
"Of a truth," said Pryderi, "gladly would I have a tale from some of your men yonder."
"Lord," said Gwydion, "we have a custom that the first night that we come to the Court of a great man, the chief of song recites. Gladly will I relate a tale."
Now Gwydion was the best teller of tales in the world, and he diverted all the Court that night with pleasant discourse and with tales, so that he charmed every one in the Court, and it pleased Pryderi to talk with him.
And after this, "Lord," said he unto Pryderi, "were it more pleasing to thee, that another should discharge my errand unto thee, than that I should tell thee myself what it is?"
"No," he answered, "ample speech hast thou."
"Behold then, lord," said he, "my errand. It is to crave from thee the animals that were sent thee from Annwn."
"Verily," he replied, "that were the easiest thing in the world to grant, were there not a covenant between me and my land concerning them. And the covenant is that they shall not go from me, until they have produced double their number in the land."
"Lord," said he, "I can set thee free from those words, and this is the way I can do so; give me not the swine tonight, neither refuse them unto me, and tomorrow I will show thee an exchange for them."
And that night he and his fellows went unto their lodging, and they took counsel.
"Ah, my men," said he, "we shall not have the swine for the asking."
"Well," said they, how may they be obtained?"
"I will cause them to be obtained," said Gwydion.
Then he betook himself to his arts, and began to work a charm. And he caused twelve chargers to appear, and twelve black greyhounds, each of them white-breasted, and having upon them twelve collars and twelve leashes, such as no one that saw them could know to be other than gold. And upon the horses twelve saddles, and every part which should have been of iron was entirely of gold, and the bridles were of the same workmanship. And with the horses and the dogs he came to Pryderi.
"Good day unto thee, lord," said he.
"Heaven prosper thee," said the other, "and greetings be unto thee."
"Lord," said he, "behold here is a release for thee from the word which thou spakest last evening concerning the swine; that thou wouldst neither give nor sell them. Thou mayest exchange them for that which is better. And I will give these twelve horses, all caparisoned as they are, with their saddles and their bridles, and these twelve greyhounds, with their collars and their leashes as thou seest, and the twelve gilded shields that thou beholdest yonder."
Now these he had formed of fungus.
"Well," said he, "we will take counsel."
And they consulted together, and determined to give the swine to Gwydion, and to take his horses and his dogs and his shields. Then Gwydion and his men took their leave, and began to journey forth with the pigs.
"Ah, my comrades," said Gwydion, "it is needful that we journey with speed. The illusion will not last but from the one hour to the same tomorrow."