About fifteen miles to the westward of Crickaeth there is a lofty hill, called Carn Madryn, which is noted for having been a strong hold of Roderick and Maelgwyn, the sons of Owen Gwyneth.

There are many remains of fortifications upon it, from which may be ascertained what was the state of architecture at an early period among the Welsh. "the bottom, sides, and top are filled with cells, oblong, oval, or circular, once thatched, or covered from the inclemency of the weather: many of them are pretty entire. The chieftains resided on the top; the people of the country, with their cattle, in times of invasion, occupied the sides and bottom." (Pennant).

The stones of the walls are not connected by cement, but are thrown roughly together, and with infinitely less attention to neatness and arrangement than would be observed by a Briton of the present day in the construction of a pig-sty.