Question

How long did Charlemagne’s empire have an influence on Europe?

for decades, until Charlemagne’s death
until the Catholic Church lost power
for more than eight hundred years
for at least one hundred years after Charlemagne’s death

Answer 1

for more than eight hundred years.

Charlemagne was crowned emperor in 800, and the Holy Roman Empire — which claimed his legacy — continued in various forms until 1806 (dissolved by Napoleon). His political, legal and religious reforms shaped medieval and early modern Europe for roughly a millennium.