Whitland Abbey

Whitland Abbey was a country house and Cistercian abbey in the parish of Llangan, in what was the hundred of Narberth, Carmarthenshire, Wales. The town which grew up nearby is now named Whitland after it. It was widely known as Ty Gwyn ar Daf, meaning White House on the Taf, in reference to the country house originally built here before it became a monastic settlement which was known under that name. It is most associated with being the place where Hywel Dda drew up his laws around 940. It functioned as a Cistercian monastery between the 12th and 16th centuries.

Source: Wikipedia