It is said that a weaver from Pontypridd in Mid Glamorgan, Evan James, wrote
the words one Sunday morning in January 1856 to a tune composed by his
son James James, which was possibly based on an old harp melody.The date of
the song's adoption as the National Anthem is uncertain, but it is known that
the tune was given prominence during the National Eisteddfod held at Bangor
in 1874, and since that date has been considered the song which, more than any
other, expresses Welsh national sentiment.
Now afforded official status as the National Anthem of Wales by general assent, Hen Wlad fy Nhadau is sung on a wide variety of occasions throughout the country.
An English translation of Hen Wlad fy Nhadau :-
Land of my fathers - Wales