Norwegian black metal band Enslaved
were formed in 1991 by guitarist/keyboardist Ivar Bjørnson and bassist Grutle Kjellson; a demo titled Yggdrstll
followed a year later. The group's official albums during the 1990s included 1994's Frost
, 1997's Eld
, and 1999's Blodhemn
. In fall 2000, the band issued Mardraum
, and continued over the following decade and beyond with the full-lengths Monumension (2001), Below the Lights (2003), Isa (2004), Ruun (2006), Vertebrae (2008), Axioma Ethica Odini (2010), and RIITIIR (2012). Personnel shifts have plagued the group throughout its existence; as of 2012, its membership included original members Bjørnson and Kjellson along with guitarist Arve Isdal, drummer Cato Bekkevold, and keyboardist/vocalist Herbrand Larsen.