Thomas Börje Forsberg (17 February 1966 – 3 June 2004), better known by the stage name Quorthon, was a Swedish musician. He was one of the founders, as well as the sole songwriter, of the band Bathory, which pioneered the black metal genre and is credited with creating the Viking metal style. A multi-instrumentalist, Quorthon wrote the music and lyrics on all of Bathory's albums and performed vocals and guitars.