Tredegar is a town in the county borough of Blaenau Gwent, situated on the River Sirhowy in the Sirhowy Valley in south-east Wales. The historic Tredegar Iron Works in Richmond, Virginia, United States was named in honour of the town. History Industrialisation From the mid-16th century to 1974, Tredegar lay in the historic county of Monmouthshire. It became an early centre of the Industrial Revolution in South Wales. In 1778 an iron furnace was built in Sirhowy by Thomas Atkinson and William B… (More on Tredegar)