Island of the Mighty
Ynys Y Kedyrn, the Island of the Mighty, is one of the many names bestowed upon Britain by the Welsh. Lady
Guest states that a Triad from her sources, in which several more of these ancient appellations are preserved, asserts that
while yet uninhabited the Island was called Clas Merddin, but that after its colonization it bore the name of Vel Ynys, which
was again changed in compliment to its conquest by Brut, into Ynys Prydain, or the Island of Brut. The same Triad states that
some authorities attribute the more modern designation to its conquest by Prydain son of Aedd the Great.