The village of Crymych and the hamlets of Hermon, Glandwr and the eastern part of Pentre Galar are in Llanfyrnach parish.

Llanfyrnach village is in a remote upland area on the headwaters of the River Tâf, about 11 miles (18 km) from Cardigan.

Mining occurred on a small scale for the sake of the low but significant concentration of silver in the ores, perhaps from as early as the 16th century.

As a result of high demand for lead in the Victorian era, the mine was greatly extended in the 1840s, and had reached 520 m below the surface by the time of its closure in 1890.

[9] The present church is mid-Victorian, but there has been a Christian community in the village since at least the 6th century when Saint Brynach is believed to have come to the area.