Isle of Ynys Dryyll, North Wales, 835 AD Isle of Ynys Dryyll, North Wales, 835 ADEvents are mutable, but places remain essentially unchanged. In the case of Ynys Dryyll, even the youthful Alun ap Drystan sensed ancient immutability hanging over the isle as perceptible as the grey cloud shrouding it. The companions arrived at Ceris, the narrow point of the strait separating the isle from the mainland, where the Roman legions had once crossed to the place of druids, to the island they called Mona. A ferry served to cross the channel, and the friends found the ferryman pottering about in the tiny hut that was his home. “A puffin to take us across to the isle,” Cadfael said, sticking his head without ceremony into the gloomy interior. The ferryman laughed and waved a net attached to a pole