CHAP. III.-ARCHEOLOGICAL.

THE parish contains many vestiges of earthworks and remains, of which we shall proceed to notice the most important.

Plas-yn-Dinas is situate on part of the land belonging to Pont-y-Pentref, called the Park, near Trewylan. It is very conspicuous from the Meifod road, about a quarter of a mile from the village, being a natural formation, which has been made serviceable for defensive purposes by the addition of an intrenchment. It is on the banks of an old channel of the Vyrnwy, and is distant from Clawdd Coch, a reputed Roman camp, by some supposed to be the site of the ancient Mediolanum, about two miles and a half. The position is very commanding, enabling its occupants to keep a good look out over the surrounding country. This camp is a parallelogram, surrounded by a deep and wide ditch, which is filled with water, rising near the farmhouse of Trewylan isaf. Near the summit a second dry ditch runs all round, which is still nearly in a perfect state on the north and west sides, and which must have rendered it almost unassailable. It is It is suggested that this post formed one of the British defences that surrounded Caer Meifod, or Meigen. Others contend that it is Roman work, and in the Roman style of encamping. (See Roman Antiquities, by Dr. Alexander Adam, p. 342). There is good ground in the writer's opinion to suppose that it forms part of the vestiges of the ancient Mediolanum. "The old town," tradition states, extended from Tref-y-ddedfryd to Bryn-Mawr; and we find a chain of defensive earthworks, and vestiges of old encampments, running parallel with the river from Mathrafal to Clawdd Coch, the distance between each being about two miles and a half. We have little or no account of this station. Tradition relates that there was a castle here called