four Cantrevs of Ceredigiawn, and the three of Ystrad Tywi.

At that time, Math the son of Mathonwy could not exist unless his feet
were in the lap of a maiden, except only when he was prevented by the
tumult of war. Now the maiden who was with him was Goewin, the daughter
of Pebin of Dol Pebin, in Arvon, and she was the fairest maiden of her
time who was known there.

And Math dwelt always at Caer Dathyl, in Arvon, and was not able to go
the circuit of the land, but Gilvaethwy the son of Don, and Eneyd {81}
the son of Don, his nephews, the sons of his sister, with his household,
went the circuit of the land in his stead.

Now the maiden was with Math continually, and Gilvaethwy the son of Don
set his affections upon her, and loved her so that he knew not what he
should do because of her, and therefrom behold his hue, and his aspect,
and his spirits changed for love of her, so that it was not easy to know
him.

One day his brother Gwydion gazed steadfastly upon him. "Youth," said
he, "what aileth thee?" "Why," replied he, "what seest thou in me?" "I
see," said he, "that thou hast lost thy aspect and thy hue; what,
therefore, aileth thee?" "My lord, brother," he answered, "that which
aileth me, it will not profit me that I should own to any." "What may it
be, my soul?" said he. "Thou knowest," he said, "that Math the son of
Mathonwy has this property, that if men whisper together, in a tone how
low soever, if the wind meet it, it becomes known unto him." "Yes," said
Gwydyon, "hold now thy peace, I know thy intent, thou lovest Goewin."

When he found that his brother knew his intent, he gave the heaviest sigh
in the world. "Be silent, my soul, and sigh not," he said. "It is not
thereby that thou wilt succeed. I will cause," said he, "if it cannot be
otherwise, the rising of Gwynedd, and Powys, and Deheubarth, to seek the
maiden. Be thou of glad cheer therefore, and I will compass it."

So they went unto Math the son of Mathonwy. "Lord," said Gwydion, "I
have heard that there have come to the South some beasts, such as were
never known in this island before." "What are they called?" he asked.
"Pigs, lord." "And what kind of animals are they?" "They are small
animals, and their flesh is better than the flesh of oxen." "They are
small then?" "And they change their names. Swine are they now called."
"Who owneth them?" "Pryderi the son of Pwyll; they were sent him from
Annwn, by Arawn the king of Annw