Tuan, son of Cairill, as we are told, Was freed from sin by Jesus; One hundred years complete he lived, He lived in blooming manhood. 2. Three hundred years in the shape of a wild ox He lived on the open extensive plains; Two hundred and five years he lived In the shape of a wild boar. 3. Three hundred years he was still in the flesh In the shape of an old bird; One hundred delightful years he lived In the shape of a salmon in the flood. 4. A fisherman caught him in his net, He brought it to the king’s palace; When the bright salmon was there seen, The queen immediately longed for it. 5. It was forthwith dressed for her, Which she alone ate entire; The beauteous queen became pregnant, The issue of which was Tuan. [Sidenote: Cymric legends.] These legends, however, though it has been thought to indicate their real character and to inquire how far they may be supposed to embody ethnologic and linguistic facts or to contain an element of historic truth, in reality concern us only in so far as they tend to throw light upon the constituent elements of the Celtic population of Scotland and the corresponding territorial divisions of the land. So far as regards the early Celtic peoples south of the Firths of Forth and Clyde, we must turn in the first instance to the Cymric legends.[110] They tell us that this population may be referred to three races, the Brython, the Romani, and the Gwyddyl. Thus in a poem contained in the Book of Taliessin we find them thus alluded to:— Three races cruel from true disposition, Gwyddyl and Brython and Romani, Create discord and confusion; And about the boundary of Prydain, beautiful its towns, There is a battle against chiefs above the mead vessels[111] Although the word _Gwyddyl_ is in modern Welsh usually translated _Irish_, yet there can be no doubt that it was originally used in a much wider sense as the equivalent of the Irish word _Gaidheal_, and was applied to the whole Gaelic race wherever located. Of this there is ample evidence in the old Welsh poems. The Brython are, of course, the Brettones of Bede, or rather here that part of them which occupied the districts extending from the Derwent to the Clyde, and formed the ancient Cumbria. In the same poem they appear under their national name of Cymry, when it is said, From Penryn Wleth to Loch Reon (that is, from Glasgow to Loch Ryan), The Cymry are of one mind, bold heroes.