Dydd Dewi Sant

The National Day of Wales is always 1st of March, Dydd Dewi Sant, and we all wear a yellow daffodil flower. Dewi was one of the founders of the Celtic Church (c.589 AD) in the British Isles, and his day is celebrated with much singing of songs like Calon Lân.
Calon Lân is also sung before every rugby match thoughout the season, often by 1000's at a match. It is also sung beautifully in pubs, clubs, churches ! and by folksingers.
Nid wy'n gofyn bywyd moethus,
Aur y byd na'i berlau mân,
Gofyn 'rwyf am galon hapus,
Calon onest, calon lân.

Calon lân yn llawn daioni,
Tecach yw na'r lili dlos:
Dim ond calon lân all ganu
Canu'r dydd a chanu'r nos.
The first part translates as:
I don't ask for a luxurious life,
the world's gold or its fine pearls,
I ask for a happy heart,
an honest heart, a pure heart.
Here is Canol Lân sung by Bryn Tervel and choir: