Merthyr Tydfil (/ˈmɜrθər ˈtɪdvɪl/; Welsh: Merthyr Tudful ) is a town in Wales, with a population of about 30,000. Although once the largest town in Wales, it is now ranked as the 15th largest urban area in Wales. It also gives its name to a county borough, which has a population of around 55,000. It is located in the historic county of Glamorgan. It is often referred to simply as 'Merthyr'. The current administrative area of the Merthyr County Borough consists of the northern part of the Taff Valley and the smaller neighbouring Taff Bargoed Valley.
According to legend, the town is named after Saint Tydfil, a daughter of King Brychan of Brycheiniog. According to her legend she was slain at Merthyr by pagans around 480; the place was subsequently named Merthyr Tydfil in her honour. Although the usual meaning of the word merthyr (from the Latin martyrium) in modern Welsh is 'martyr', it is probable that the meaning here is "church (in memory of a saint or on his/her grave)." Similar examples, all from south Wales, include Merthyr Cynog, Merthyr Dyfan and Merthyr Mawr. The Cornish and Breton language equivalents, in place names, are merther and merzher.
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