Øystein Aarseth (; 22 March 1968 – 10 August 1993), better known by his stage name Euronymous, was a Norwegian guitarist. Euronymous was a founder of and central figure in the early Norwegian black metal scene. He was a co-founder of the Norwegian black metal band Mayhem and was the only constant member from the band's formation in 1984 until his death in 1993. He was also founder and owner of the extreme metal record label Deathlike Silence Productions and record shop Helvete.