atamenia was founded in 1995 by original members guitarist Riku Hopeakoski and vocalist Mika Tönning in Oulu, Finland and within a year they had recruited the rest of the band to feature Olli Nissinen (guitar), Timo Lehtinen (bass) and Tero Pesonen (drums) and create their first demo, titled simply Demo. The second demo, Winds, (1996), followed shortly later and led to a four-album-contract with Massacre Records' in 1997, resulting in their first full-length album, Halls Of Frozen North (1997), under the revised membership of Sampo Ukkola (guitar) taking over from Nissinen, Timo Lehtinen assuming bass, Toni Tervo taking over drums and Heidi Riihinen added on keyboards.
A year after the release of the full length debut, Halls of Frozen North they recorded their second album, Morning Crimson (1999), an album that followed the Massacre Classix (Shape-CD; 1999). In 2000, their third opus followed in the form of Eternal Winter's Prophecy and another line-up shift with Sir Kimmo Luttinen taking over the drums, while Ari Nissilä took over guitar duties from Ukkola.
Now it was time to record their last contractual album with Massacre' and Eskhata (2002) was the result. Both operations subsequently renewed their business relationships and to celebrate, a line-up change ensued with Veikko "Moottorisaha" Jumisko taking on drums, Tero "Vitun Hippi" Nevala also on keyboards and Tero "Vitun Hippi" Nevala assumed the other keyboards spot, while the other members assumed pseudonyms of Riku "K-oz" Hopeakoski (guitar), Ari "WarTechs" Nissilä (guitar) and Timo "Lede" Lehtinen (bass), Tönning was not in the membership as his vocals were not needed; the bulk of the changes occurring during rehearsals. The line-up remained stable (with Tönning returning) for their final set thus far, ChaosBorn (2003), an album that combined melodies and aggression with balance.