Sir John Rhys, Celtic Folklore: Welsh and Manx…
“ One fine evening in the month of June a brave, adventurous youth, the heir of Ystrad, went to the banks of the Gwyrfai, not far from where it leaves Cweỻyn Lake, and hid himself in the bushes near the spot where the folks of the Red Coats—the fairies—were wont to dance. The moon shone forth brightly without a cloud to intercept her light; all was quiet save where the Gwyrfai gently murmured on her bed, and it was not long before the young man had the satisfaction of seeing the fair family dancing in full swing. ”
