"Under The Sign Of The Black Mark" is the third studio album by Swedish metal band Bathory, originally released in the fall of 1986. It is widely regarded to be one of the most highly influential albums in the overall development of the metal genre. It's been called nothing short of a masterpiece, and was even listed on the Rolling Stone's 100 Greatest Metal Albums of All Time list.
Bathory was an iconic black metal band that formed in Sweden in 1983. It was named after Hungarian countess Elizabeth Báthory, a noblewoman and serial killer. They are considered the pioneers of black metal (alongside Venom and Mercyful Fate) and one of the very first to explore the genre of Viking metal. Bathory and their first 4 albums are seen as the "blueprint for Scandinavian black metal" but after discovering their Viking metal style, they were hooked. They stopped performing live early on and never toured, the frontman was the sole constant member and at times responsible for all instruments. The band ended with his sudden death in 2004.