The story, as it proceeds, mentions Trinio engaged in battle with the men of a prince who seems to have been no other than Brychan of Brycheiniog, supposed to have died about the middle of the fifth century. The battle was disastrous to Trinio and his friends, and Trinio was never seen afterwards; so Walter Mapes reports the fact that people believed him to have been rescued by his mother, and that he was with her living still in the lake. Giraldus calls it lacus ille de Brecheniauc magnus et famosus, quem et Clamosum dicunt, 'that great and famous lake of Brecknock which they also call Clamosus,' suggested by the Welsh Llyn Llefni, so called from the river Llefni, misinterpreted as if derived from llef 'a cry.' With this lake he connects the legend, that at the bidding of the rightful Prince of Wales, the birds frequenting it would at once warble and sing. This he asserts to have been proved in the case of Gruffud, son of Rhys, though the Normans were at the time masters of his person and of his territory [29]. After dwelling on the varying colours of the lake he adds the following statement:--Ad hæc etiam totus ædificiis consertus, culturis egregiis, hortis ornatus et pomeriis, ab accolis quandoque conspicitur, 'Now and then also it is seen by the neighbouring inhabitants to be covered with buildings, and adorned with excellent farming, gardens, and orchards.' It is remarkable as one of the few lakes in Wales where the remains of a crannog have been discovered, and while Mapes gives it as only two miles round, it is now said to be about five; so it has sometimes [30] been regarded as a stockaded island rather than as an instance of pile dwellings.
In the Brython for 1863, pp. 114-15, is to be found what purports to be a copy of a version of the Legend of Llyn Syfadon, as contained in a manuscript of Hugh Thomas' in the British Museum. It is to the effect that the people of the neighbourhood have a story that all the land now covered by the lake belonged to a princess, who had an admirer to whom she would not be married unless he procured plenty of gold: she did not care how. So he one day murdered and robbed a man who had money, and the princess then accepted the murderer's suit, but she felt uneasy on account of the reports as to the murdered man's ghost haunting the place where his body had been buried. So she made her admirer go at night to interview the ghost and lay it. Whilst he waited near the grave he heard a voice inquiring whether the innocent man was not to be avenged, and another replying that it would not be avenged till the ninth generation. The princess and her lover felt safe enough and were married: they multiplied and became numerous, while their town grew to be as it were another Sodom; and the original pair lived on so astonishingly long that they saw their descendants of the ninth generation. They exulted in their prosperity, and one day held a great feast to celebrate it; and when their descendants were banqueting with them, and the gaiety and mirth were at their zenith, ancestors and descendants were one and all drowned in a mighty cataclysm which produced the present lake.