De Mysteriis Dom Sathanas is the first full-length studio album by the Norwegian black metal band Mayhem. Songwriting began in 1987, but due to the suicide of vocalist Per "Dead" Ohlin and the murder of guitarist Ì÷ystein "Euronymous" Aarseth, the album's release was delayed until May 1994. De Mysteriis Dom Sathanas is widely considered one of the most influential black metal albums of all time.