Silenoz (born Sven Atle Kopperud on 1 March 1977) is a Norwegian guitarist who is a founding member, along with Shagrath and Tjodalv, of the Norwegian symphonic black metal band Dimmu Borgir, of which he is also the primary songwriter and creative lead.
Silenoz explained in an interview that his stage-name is derived from an alternative Latinised spelling of the Greek “Silenus”, the name of a satyr-like being in Greek mythology who was a tutor to the wine god Dionysus, and was said to possess special knowledge and the power of prophecy while intoxicated. In the early days of the band, he used as stage name Erkekjetter Silenoz (erkekjetter being Norwegian for “arch heretic”), having it shortened later to Silenoz.