Bathory were an extreme metal group formed in Vällingby, Sweden, in 1983 named after Hungarian countess Elizabeth Báthory. The band's frontman and main songwriter was Quorthon (Tomas Forsberg). Considered to be one of the most influential acts in heavy metal, Bathory's first four albums are considered to be "the blueprint for Scandinavian black metal". The band departed from this style on their fifth album, Hammerheart (1990), which is often cited as the first Viking metal album. Bathory continued in the Viking metal style throughout the 1990s and early 2000s, although the band experimented with thrash metal on the albums Requiem (1994) and Octagon (1995). Bathory ended when Quorthon died from heart failure in 2004.
