Announced during the publisher's PdxCon event, it will be the fourth expansion to last year's hit strategy game adding playable Pagan and Zoroastrian rulers.
The new rulers will put a focus on Viking culture, with the ability to loot and pillage other provinces.
There will be a new start date in 867 AD, which sees the Viking Rurik founding the kingdom of Rus and leading an army through England.
The expansion will also give rebellions character leaders with their own agendas as well as landless adventurer characters that can gather armies on their own.
Invasions are another new feature, as players can declare their intention to invade a neighbour and allow adventurers and other warriors to join their army.
Crusader Kings 2: The Old Gods will be available on PC and Mac during the second quarter of 2013.
Gallery - images of Crusader Kings 2: The Old Gods below:
Copyright: Paradox Interactive