Dimmu Borgir is a Norwegian black metal band from Oslo, Norway, formed in 1993. Dimmu borgir means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse. The name is derived from a volcanic formation in Iceland, Dimmuborgir. The band has been through numerous line-up changes over the years; guitarist Silenoz and vocalist Shagrath are the only founding members remaining.