Circus Maximus began writing their debut album in 2004 entitled, The 1st Chapter which was released in May 2005. The eight-tracked album contains the longest Circus Maximus song with the title track running for over 19 minutes. The album also came with two bonus tracks. Half a year later, in November 2005, keyboards player Espen Storø decided to leave the band for personal reasons. In early 2006, Lasse Finbråten joined the band, filling the vacant spot. During 2005 Circus Maximus went on their first tour with their major performance being in Atlanta in the United States where they played at the ProgPower festival. Circus Maximus then returned to the same festival the following year with their new keyboardist. During the rest of 2006 Circus Maximus continued to play gigs around Scandinavia with other major acts such as Kamelot, Pagan's Mind and Glenn Hughes.
''Isolate'' (2007)
Circus Maximus spent the first quarter of 2007 recording their second studio album, Isolate, which was released on August 7, 2007. Before the release, as a response to impatient and expectant fans, the band established a post on the official where they kept readers up-to-date on their studio-progress. Following the release of Isolate the band went on tour playing at major festivals such as ProgPower Europe, ProgPower Scandinavia, Sweden Rock and MetalHear. They also went on many solo shows while on the road. During February 13 to March 5, 2008 the band toured Europe as an opening act at the Symphony X . On November 18 the band posted this message in their website: "Circus Maximus will now be entering the studio to start the pre-production of the next album, planned to be released late 2010. We are writing new stuff everyday and so far we have more or less 8 songs completed for the album and we can honestly tell you it sounds AMAZING! Can't wait to show you ;) We would like to thank everyone who have been supporting us throughout the years... you're the best! - Truls, Mats, Lasse, Glen and Michael." According to the band's official forums, on the 22nd June 2010 Michael Eriksen posted some news on the recording process and said "Yesterday Mats and myself hit the studio to start the vocals on one of the tracks", he later mentioned that "We will have some videos up and running for you in a bit".
''Nine'' (2012–2015)
The third album, called Nine was released on 1 June 2012. The band described the album as being both more melodic and more dynamic than their two preceding albums.
''Havoc'' (2016–2017)
The first single from Havoc, "The Weight", was released on 19 January 2016. Vocalist Michael Eriksen was later cast as a guest singer in Ayreon's ninth studio album titled The Source.
''Live Albums'' (2017-present)
The first of Circus Maximus' live albums, entitled Havoc in Olso was released on 4 August 2017, featuring songs from across all four of the previous albums but with a bias towards their newer songs. The second live album arrived on 6 September 2019 entitled Nine Live. It contains a live performance of their 2012 album Nine in its entirety.
