Llanharn Caermarthenshire Universal British Directory 1791

Is a small town in South Wales, with a market on Fridays, and a fair on Dec. 10. It is seated at the mouth of the river Towey, near the ruins of two old castles, one of which is Dinas Bran. It is pretty well built, and has some trade; is seven miles south-west of Caermarthen, and 223 west-north-west of London.

Source: The Universal British Directory of Trade, Commerce, and Manufacture 1791. Vol. 5.