Dimmu Borgir /ˌdɪmuː ˈbɔrɡɪr/ is a Norwegian black metal band from Oslo, Norway, formed in 1993. The name is derived from Dimmuborgir, a volcanic formation in Iceland, the name of which means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse. The band has been through numerous lineup changes over the years; guitarist Silenoz and vocalist Shagrath are the only founding members remaining.
Dimmu Borgir was founded in 1993 by Shagrath, Silenoz and Tjodalv; the band released an EP in 1993 entitled Inn i evighetens mørke ("Into the Darkness of Eternity" in English). This short EP sold out within weeks, and the band followed up with the 1994 full-length album For All Tid ("For All Time" in English).