Soon after leaving the lake the Dee passes through a district that is closely connected with the youth of that great Celtic hero, King Arthur. There are few parts of Wales which--by their names, at least--allow us to forget that Arthur and his Court played a famous part in Britain in the days before history. And here we have Caer Gai, the ancient stronghold of Sir Kay, the foster-brother of Arthur, who could make himself as tall as the tallest tree in the forest, or lie hidden in lake or river for nine days and nights, if needs be. Such fire was in his nature that when they needed warmth his companions had but to kindle the piled wood at his finger; he could walk through torrents of rain as dry as on a summer’s day; he could go for nine days and nights without sleep; and no doctor could heal the wounds made by his sword. It was in this district of Penllyn, opposite to the hill of Yr Aran, which he calls “Rauran,” that Spenser in his great poem makes King Arthur describe the way his boyhood was passed in the “stronghold of Kay,” or Caer Gai: “Whose dwelling is low in a valley green Under the fort of Rauran, mossy hoar, From whence the River Dee, as silver clean, His tumbling billows rolls with gentle roar; There all my days he trained me up in virtuous lore.” But, apart from legend, Caer Gai touches history itself. From its well-preserved ramparts and “fosse,” or moat, enclosing what is now a farm-house, we see that it must have once been a Roman fortress. Roman urns have been dug up here, and not very many years ago a ploughman turned up a stone with an inscription that showed it must have been placed there by Roman soldiers about A.D. 105. Leaving Llyn Tegid, or Bala Lake, behind us, we set off down our river to Corwen and Llangollen. These places we have already visited, so we will only stay to notice the lovely scenery of this part of the Dee, so dear to fishers. Not far from where the river bends north-east to Chester and the sea, stands Chirk Castle, and near by, in order to reach it from Llangollen, we shall pass the line of Offa’s Dyke, a bank with a moat below it that ran from the mouth of the Dee to the mouth of the Wye, which was erected by a King of Mercia in the eighth century as a barrier beyond which no Welshman might pass. For the rest of its course, therefore, the Dee really forms part of the boundary-line between England and Wales, and though we shall be sorely tempted to linger when we come to the beautiful old city of Chester, gazing down from its ancient walls upon the broad river below, we must remind ourselves that this is English soil, and leave the sacred waters of the Dee to empty themselves by a very long estuary into the sea some miles below Flint Castle, the last refuge of the unhappy Richard II. before he gave himself into the hands of Bolingbroke. CHAPTER X A PEEP AT PEMBROKE