Analysis of Imitation of a Welsh Poem

AND that was when the chevaldour
Through the whole of night
Sang, for the moon of mid-July
Made the hillside bright.

Morfydd to David ap Gwillam spoke
When the song they did not hear,
'Something is stirring in the fern,
A living thing comes near.'

'Twas not the wolf, 'twas not the deer
That came with pause and bound;
A creature stood above the pair
Ap Gwillam's Irish hound

And knew them then, and knew them there
Where the pine branches wave,
As close beside, as deep in earth,
As lone as in a grave!