Williamstown, Rhondda Cynon Taf

Williamstown Welsh: Trewiliam
Williamstown Location within Rhondda Cynon Taf
OS grid reference	ST002907
Principal area	Rhondda Cynon Taf
Preserved county	Mid Glamorgan
Country	Wales
Sovereign state	United Kingdom
Post town	TONYPANDY
Postcode district	CF40
Dialling code	01443
Police	South Wales
Fire	South Wales
Ambulance	Welsh
UK Parliament	Rhondda
Senedd Cymru – Welsh Parliament	Rhondda
List of places UK Wales Rhondda Cynon Taf 51°36′25″N 3°26′31″W / 51.606989°N 3.441819°W / 51.606989; -3.441819

Williamstown (Welsh: Trewiliam) is a village in the Rhondda Valley in the county borough of Rhondda Cynon Taf, within the historic county boundaries of Glamorgan, Wales. Williamstown was founded in the 1870s, is located at the foot of Mynydd Dinas and is a district of neighbouring village Penygraig.

Before the Rhondda was industrialised in the mid to late 19th century, the area where Williamstown now resides, was made up of woodlands occupied by sparsely populated farmlands. Williamstown exhibits very little evidence of early habitation, a few Bronze Age cairns have been discovered on Mynydd Dinas, but most hafodi and farm houses tended to group around the River Rhondda located lower down the valley.

Much of the land in the Rhondda, once controlled by individual farmers, had been bought up by wealthy absentee landlords by the start of the 19th century. The land which would become Williamstown was bought by Walter Coffin, the pioneer of coal mining in the Rhondda, around the 1850s. In 1867 this land was inherited by the Williams family, through their father, a cousin of Coffin. The Williams family gave their name to the town that was built on their land and among the trustees of the family was Caroline Elizabeth Williams, Arthur John Williams and Morgan Bransby Williams.^[1]

• Rhondda Cynon Taf Library Services, Heritage Trail:Penygraig