John Rhŷs,
Lectures on the Origin and Growth of Religion As Illustrated by Celtic Heathendom
(1888)
“ The next group of tales to be mentioned gives us, for comparison with Gwydion and others, a remarkable Ultonian poet called Aitherne, who belonged to Conchobar mac Nessa's court at a time when the Ultonians are represented enjoying such prosperity and power that they were occasionally much puzzled how to find an excuse for invading and plundering their neighbours; but, when no other means of fomenting a respectable quarrel could be found, the poets and bards might be safely entrusted to do the work ”
