The De Situ Brecheniauc lists: Meleri, Hunydd, Gwladys, Ceingar, Tudglid, Nyfain, Gwawr, Marchell, Lluan, Gwrygon Goddeu, Arianwen, Bethan, Ceinwen (Keyne), Cerddych, Clydai, Cynheiddon (identified with Saint Endelienta), Dwynwen, Eiliwedd, Goleudydd, Gwen, Lludd, Tudful, Tudwystl and Tybie.
The Merthyr Tydfil club can be seen in the 2000 film House!, where it doubles as the newly opened (by Keith Chegwin) and fictional Mega Bingo building.
On 30 June 2007, Donny Osmond, who traces his family history to Merthyr Tydfil, performed the 'Donny Comes Home' concert in the park grounds.
After his football career had ended Trailor returned to his home town of Merthyr Tydfil where he was employed at the town's Hoover plant.
Another side of his many faceted personality is that of professional actor, appearing as Captain Cat in "Under Milk Wood" and as Blind Dick Llewellyn in the BBC television production of Jack Jones's "Off to Philadelphia in the Morning" (the life story of the Merthyr Tydfil composer Joseph Parry).
Edgar Rees Jones (1878–1962), British Member of Parliament for Merthyr Tydfil, 1910–1918, and Merthyr, 1918–1922
At the 1868 General Election, Merthyr Tydfil became a two-member constituency but Bruce was defeated by Henry Richard and Richard Fothergill.
In 2005, he beat Owen Money, Richard Trevithick, Joseph Parry and Lady Charlotte Guest to be named "Greatest Citizen of Merthyr Tydfil", in a public vote competition run by Cyfarthfa Castle and Museum as part of the centenary celebrations to mark Merthyr’s incorporation as a county borough in 1905
Unlike the "simple," "charming" Gothic synagogues that once graced Llanelli and Pontypridd, however, the synagogue of Merthyr Tydfil is a "Disneyland" fantasy of a building that architectural historian Sharman Kadish calls a "double-turreted Gothic folly" of a building.
Merthyr Tydfil was a miners’ seat, and power within the local Labour Party lay within the locally dominant trade union, the South Wales Miners' Federation.
Evans became a circuit judge in 1992, serving as resident judge for the Merthyr Tydfil Crown Court from 1994 to 1998 and resident judge for the Swansea Crown Court from 1998 to 1999.
He was appointed a CBE in 2002, and in June 2004 he was given a life peerage, as Baron Rowlands, of Merthyr Tydfil and of Rhymney in the County of Mid-Glamorgan.
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Rowlands served as Member of Parliament for Merthyr Tydfil until the constituency boundaries were redrawn and renamed for the 1983 general election, when he was returned for the new Merthyr Tydfil and Rhymney constituency.
William Crawshay II (1788–1867), his son, owner of Cyfarthfa Ironworks in Merthyr Tydfil
YFJ also marched from Merthyr Tydfil to Cardiff starting 4 August 2011 to highlight that Merthyr Tydfil had the fourth highest level of youth unemployment in Britain.