These following two videos will help you to understand the fall of the Western Roman Empire and the appearance of the new different kingdoms and empires in that territory.
Here more videos about the Byzantine Empire.
This video is about the rise of the Franks and the emperor Charlemagne.
The Visigoths in Hispania (Iberian Peninsula). The Kingdom of Toledo
(Watch out for the names, they are not English names)
(Watch out for the names, they are not English names)
Those are the parts of the Muslim's sacred building. The mosque.