It lies in the former county of Merionethshire/Sir Feirionnydd, and is within the Snowdonia National Park. ==Roman Fort== It was the site of a small Roman fort, known as Cefn Caer in Welsh, probably guarding a ford or ferry crossing of the Dyfi on the Sarn Helen Roman road. The remains of the fort lie under the 14th century house of Cefn Caer, ove...