This is where When The World Stopped Making Sense steps in: The mod follows the migratory period following the collapse of the Western Roman Empire in 476, and allows players to choose a starting date any time between 476 and the year 600. A copy of Crusader Kings 2 with the Charlemagne DLC allows gamers to play from 769 all the way up to 1453, but some history buffs may be interested in an even earlier starting date.