In 1989, Snorre Westvold Ruch, also known under the stage nameBlackthorn, and Marius Vold formed the bandStigma Diabolicum and recorded one demo. In 1990, bass player Harald Eilertsen and drummer Bård G. Eithun joined. As the use of Latin within black metal "had escalated", the name was changed to Thorns in 1991. The same year, Eilertsen and Ruch recorded the Grymyrk demo, which had a great impact on the black metal scene and, together with Mayhem guitarist Euronymous, coined the Norwegian black metal riffing, as Darkthrone drummer Fenriz points out. As the band members were "spread far across Norway", they could rarely rehearse; some of the rehearsals were recorded on tape. In 1992, the Trøndertun demo was recorded. The same year, Ruch became Mayhem's second guitarist and disbanded Thorns for a few months. In 1994, Ruch was sentenced to 8 years in prison for admitting to being an accomplice in the murder of Euronymous. However, according to Euronymous's murderer, Varg Vikernes, Ruch was merely "in the wrong place at the wrong time". After a long period of silence due to Ruch's imprisonment for being an accomplice in the murder of Euronymous, Thorns reappeared in 1999 with the split albumThorns vs. Emperor, consisting mainly of old Thorns songs performed by Emperor and vice versa. Then, in 2001, the debut album Thorns was released, with Hellhammer on drums and vocals by Satyr and Dødheimsgard's Aldrahn. In October 2007, Greek label Kyrck Productions released the Stigma Diabolicum compilation, which featured both the Grymyrk and Trøndertun demos, as well as material from the Stigma Diabolicum demos Lacus de Luna and Luna de Nocturnus and two tracks from a 1991 Thorns rehearsal. A follow up to the 2001 debut was announced in September 2008. The bandline up has undergone significant changes since the 2001 album. Snorre is still handling the guitars and Aldrahn will be performing all the vocals on the upcoming album. Bassist Jon Wesseltoft, guitarist Christian Broholt, and drummer Kenneth Kapstad have joined the band.
Thorns Ltd. - experimental/drone/art-circuit offshoot of Thorns featuring Snorre Ruch and Jon Wesseltoft.
Mayhem - band in which Snorre played guitars for a short while. He also wrote some of the riffs on De Mysteriis Dom Sathanas. Also Hellhammer's main band.
Dødheimsgard - band for which Aldrahn performs vocals.
Burzum - solo project of Varg Vikernes who was imprisoned along with Snorre for the murder of Euronymous. Thus is responsible for the breakup of Thorns.