Dimmu Borgir () is a Norwegian symphonic black metal band from Jessheim, 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; vocalist Shagrath and rhythm guitarist Silenoz are the only original members who still remain, with lead guitarist Galder being a longstanding member.

Dimmu Borgir was founded in 1993 by Silenoz and Tjodalv. Shagrath, Brynjard Tristan, & Stian Aarstad later joined Dimmu Borgir, and then released an EP in 1994 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). This album featured vocal contributions by Vicotnik of Ved Buens Ende and Dødheimsgard and Aldrahn of Dødheimsgard and Zyklon-B. The initial line-up consisted of Shagrath playing drums with Tjodalv on guitar and Silenoz contributing lead vocals. This line-up changed before the release of Stormblåst ("Stormblown" in English) on Cacophonous Records in 1996, an album considered by many to be their finest. It is also the last album which features all lyrics written and sung in Norwegian.

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