Tremeirchion (previously known as Lleweni) is a small residential community in Denbighshire, Wales. It is located on the B5429 road, to the north east of Denbigh and to the east of St Asaph. The town was part of the traditional lands of the Salusbury family and the Cotton baronets. It was dominated by these two families until the early part of the twentieth century. It briefly became well known during the fin de siècle after a series of dinosaur bones were found in the area. The town does not possess a shop or any other commercial activity although one pub, the Salusbury Arms, operates daily with the exception of Monday.