Arthurian (Britain 481 AD to 685 AD) is a mod project based on Barbarian Invasions pack. Action will take place during Britain dark ages, in Britain, Ireland and Northern Gaul, from 481 AD to 685 AD. Factions; 11 Briton tribal factions, 3 Irish tribal factions, 3 Anglo-Saxon factions and France.
Why is every environment in Britain Mediterranean-type?
I have no idea I will have to have a look when I reinstall it, you may find more answers here Twcenter.net(BI)