In the 7th century, Northern Europe is split between two realms: the Frisians, Saxons, and Danes inhabit the land above the rivers, while the Franks reside below. The Franks aim to unify Europe, a feat even the Romans failed to achieve. To achieve this, they employ a new tool: Christianity, which they use to enslave the native inhabitants. Their sights are set on Europe's primary trading hub, where King Aldigisl of the Frisians holds power.