They were the hounds of Arawn, a crowned king in the land of Annwn, the shadow-land of Hades.
It turned out that the stranger was Arawn, a king in Fairyland.
After dinner, and the evening story telling were over, and it was time to go to bed, Arawn's wife was surprised in double measure.
This done, Powell rode away to the trysting place in a glen, and there he met Arawn, as had been appointed.
Arawn's beautiful wife was evidently not in the secret, for she greeted Powell as her own husband.
Now at Anwyn, no one but Arawn himself knew that anything unusual had taken place.
At this answer, Arawn was overcome with surprise, and as struck with admiration at having so good a friend.
We are informed that these dogs belonged to Arawn, or the silver-tongued King of Annwn, of the lower or southern regions.
Even though Arawn spoke to her three times, he received no reply.
Arawn obtains the help of Pwyll by exchanging kingdoms with him for a year, and Pwyll defeats Hafgan.