George Bowring, A Tale Of Cader Idris by R.D. Blackmore

The Aydyr was making as much noise as ever, for the summer had been a wet one; and of course all the people of Aber-Aydyr had their ears wide open. I showed Bob the bridge and the place of my vision, but did not explain its meaning, lest my love for him should seem fiduciary; and the next morning, at his most urgent request, we started afoot for that dark, sad valley. It was a long walk, and I did not find that twenty years had shortened it.

"Here we are at last," I said, "and the place looks the same as ever. There is the grand old Pen y cada, with the white cloud rolling as usual; to the left and right are the two other summits, the arms of the chair of Idris; and over the shoulder of that crag you can catch a glassy light in the air--that is the reflection of Tal y Llyn."