Answer
The Breton anthem uses the same melody as the Welsh anthem composed by James James. This is likely because the two regions have a long history of cultural exchange, and the Welsh anthem is a popular song in Brittany. The Breton anthem is called "Bro Gozh ma Zadoù," which means "Old Land of Our Fathers." It was written in 1898 by François Vallée, and it is sung in Breton.