Ivar Tristan Lundsten (professional name: Brynjard Tristan) (born 14 June 1976) is a Norwegian bassist and songwriter, presently living in Oslo, but originally hails from the nearby municipalities of Nesodden and Jessheim. He is mostly known for his time as bassist for the black metal-band Dimmu Borgir, from 1993 to 1996, which he left after the album Stormblåst. In 1994-1995 Brynjard was also a member of Old Man's Child, where he was a songwriter and played bass on the band's demo . However, he left the band just before the release of their first album.