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Dolgellau is a welsh market town in Gwynedd, north west Wales, lying on the River Wnion, a tributary of the Mawddach. It was the county town of the former County of Merionethshire.

The area upon which Dolgellau stands was, in the pre-Roman period, part of the tribal lands of the Ordovices, who were conquered by the Romans in AD 77–78. Although a few Roman coins from the reigns of Emperors Hadrian and Trajan have been found near Dolgellau, the area is marshy and there is no evidence that it was settled during the Roman period. There are, however, three hill forts in the vicinity of Dolgellau, of uncertain origin.

After the Romans left, the area came under the control of a series of Welsh chieftains, although Dolgellau was probably not inhabited until the late-11th or 12th century, when it was established as a "serf village" (or maerdref), possibly by Cadwgan ap Bleddyn — it remained a serf village until the reign of Henry Tudor (1485–1509).

A church was built at some point in the 12th century (demolished and replaced by the present building in 1716), although Cymer Abbey, founded in 1198 in nearby Llanelltyd, remained the most important religious centre locally. Dolgellau gained in importance from this period and was mentioned in the Survey of Merioneth ordered by Edward I (Llanelltyd was not). In 1404 it was the location of a council of chiefs under Owain Glyndŵr.