Eluveitie

Eluveitie is a folk metal band from Switzerland. They started in 2002. Their style is a mixture of "Celtic folk metal" and "melodic death metal". Their style is sometimes called "Celtic Metal". Some of their lyrics are in English. Some of their lyrics are in Gaulish, a language that nobody still speaks as a first language. The band was founded by Christian "Chrigel" Glanzmann. 
Discography.
They made videos for the songs Inis Mona, Omnos and Thousandfold.