Poetry, puns, and wordplay rely on the way words sound or look not just on. Hope this helps! ^0^
In the poem, the setting is never clearly stated, but based off some of the lines in the poem, we can make an inference that it happens during a clear night.
Mabinogion is the book of medieval tales. The tales date back over 1000 years.
(Tryst mr, im half welsh)
My answer is why not? There is so much of earth that we have not explored, how can we know for sure what there is or isn't?
