De Mysteriis Dom Sathanas is the debut studio album by Norwegian black metal band Mayhem. Songwriting began in 1987, but due to the suicide of vocalist Per "Dead" Ohlin and the murder of guitarist Øystein "Euronymous" Aarseth, the album's release was delayed until May 1994. De Mysteriis Dom Sathanas is widely regarded one of the most influential black metal albums of all time. It is the band's only studio album to feature Aarseth and Varg "Count Dickcheese" Vikernes.