After the Fall of Rome...
Europe fell into chaos.
Europe was controlled by barbarians...
The barbarians set up kingdoms that were always at war with each other.
Europe was a very violent and unstable place.
Things like the Christian religion and education that had been promoted during the Roman empire seemed to be dead and gone.
...and then came CHARLEMAGNE!
Charlemagne
When Charlemagne died...
THEN CAME FEUDALISM!