Charlemagne was crowned “emperor of the Romans” by Pope Leo III in 800 CE, thus restoring the Roman Empire in the West for the first time since its dissolution in the 5th century. Charlemagne was selected for a variety of reasons, not least of which was his long-standing protectorate over the papacy.
Chinese River Valley civilization<span>although it was from 8000 to 2000 BCE They used the river for irrigation and they raised pigs and chickens. Used stone tools</span>
