How long did charlemagne’s empire have an influence on europe?

a - for decades, until charlemagne’s death
b - until the catholic church lost power
c - for more than eight hundred years
d - for at least one hundred years after charlemagne’s death

3, many invasions from the Ottoman Turks resulted in the rapid decline of the Byzantine empire, 450 AD to 1454 AD

4 Many plagues, brought over from the Turks erupted in citys like Athens and Constantinople, killing a good chunk of the Empire's population