iamat, who's only original member is Johan Edlund (guitar/vocals), is a band who started with Death Metal beginnings, mostly due to their debut, Sumerian Cry (1990), and gradually evolved into more. They were originally to be called Tabrinka, a name they used up to, and including, their debut.
Their first several albums were a confusing mish-mash between Black Metal, Goth and Death. The Astral Sleep (1991) made little attempt at correcting this. It also saw Niklas Ekstrand (drums), Stefan Lagergren (guitar) and Jorgen Thullberg (bass) join. Clouds (1992) featured Ekstrand and Lagergren leaving, with Johny Hagel (ex-Sorcerer; bass), Thomas Petersson (guitar), and Kenneth Roos (keyboards) joining. The follow-up Sleeping Beauty - Live Israel (1994) followed up as their first live effort. Lars Skold took over the drums shortly after.
The transformation was finally complete by Wildhoney (1994), where the Death vocals were mostly gone, and the Pink Floyd influences were found. This album also saw more membership shifts, with Hagel leaving to join the Cemetary offshoot Sundown, and Lars Skold (drums) joining. The follow-ups of Gaia EP (1995), the self-explanatory The Musical History Of Tiamat (2CD; 1996) and A Deeper Kind Of Slumber (1997) followed the same path. These albums were considered excellent by many critics, even if public reaction was mixed. A Deeper Kind Of Slumber saw Anders Iwers (ex-Cemetary) join on bass, while Thomas Petersson returned (he was absent since the completion of Clouds).
The long-awaited Skeleton Skeletron was released in 1999 coming across as a fresh change in their style by being more Goth and more heavy, over-all more diverse then the past albums. Judas Christ (2002) and Prey (2003), their latest, followed much the same pattern.
The band signed to 'Nuclear Blast' in June 2007, and released Amanethes on April 18, 2008.
On August 10, 2008, Thomas Wyreson quit to spend more time with family.
Their song Cain was also featured in the video game Vampire: The Masquerade - Bloodlines.
The band's next studio album, The Scarred People, was released on November 2, 2012 through 'Napalm Records'.
Footnote: Tiamat has been relatively quiet lately, and during this downtime, Edlund has embarked on a solo career outside of his Tiamat duties, releasing an album under the name Lucyfire, called This Dollar Saved My Life At Whitehorse. Lucyfire has proven to be a much brighter, Rock-oriented and considerably less Metal outfit than Tiamat, but this influence has not yet appeared in the Tiamat albums.