March 1 is St. David’s (Dewi Sant) Day, the patron saint of Wales (“Cymru”). Notable people of Welsh descent include Richard Burton, poet Dylan Thomas, and me on one side of the family.
The title is a literal translation of “Long live Wales!” courtesy of an on-line English to Welsh translation service.
The national anthem:
A better-known piece of Welsh patriotic music is Men of Harlech that is a rousing good march and also served as the tune for the alma mater of my high school.
And for Monty Python fans: “Mae fy hofrenfad yn llawn llyswennod.”