My idea is for this to be a historical fantasy roleplay which takes place during the year 800 AD. This is the time of Vikings, Anglo Saxons, Charlemagne, the Byzantine Empire, Gaelic Ireland, and the big Islamic Caliphate. The idea is that during the crowning of Charlemagne by the pope a Witcher style conjunction of the spheres happens and monsters start to ravage Europe and beyond. In this roleplay you can play as anyone from anywhere in Europe whether it be a Viking, Saxon, Frank, Irishman, Pict, or whatever. Historical accuracy is not the point of this roleplay so there's no need to stick to history in a fundamentalist fashion.