Charles G. Harper,
The Holyhead Road: The Mail-coach Road to Dublin…
“ Its site is marked distinctly, however, by a farmhouse, named after it, “Plâs Offa,” standing near the road. On the one hand, 176the Dyke, very like an ordinary hedgerow, with great trees growing on the embankment, may be seen going uphill towards Chirk Castle; on the other it plunges, straight and resolute, steeply down to the river Dee. It is on this side that the Dyke shows at its best, with an embankment in places over ten feet high, and a ditch on its outer side, six feet deep and twelve broad. Offa here built himself a monument more lasting than many of bronze or marble have proved. ”
