Respuesta :
1. The rulers who came to power after Charlemagne failed to defend the empire.
2. Europe was threatened by Muslims, Magyars, and Vikings in the 9th and 10th centuries.
2. Europe was threatened by Muslims, Magyars, and Vikings in the 9th and 10th centuries.
Who would rule after Charlemagne AND the invasions by Muslims, Magyar, and Vikings (9th-10th centuries)