Gylve Fenris Nagell (born 28 November 1971), better known as Fenriz, is a Norwegian musician and politician who is best known as being one half of the metal duo Darkthrone, alongside Nocturno Culto.
Although primarily a drummer, he has also performed bass, guitar, and vocals for Darkthrone and a number of other metal bands.
Fenriz is known for his encyclopedic knowledge of many different forms of music (notably metal), his eager support of other underground bands, and his lack of interest in the mainstream music business in general.
Fenriz has had multiple solo projects, including the folk black metal project Isengard, the dark ambient project Neptune Towers and the doom metal project Valhall.