Final answer:
After the collapse of the western half of the Roman Empire, the eastern half, known as the Byzantine Empire, survived for another thousand years. They spoke Greek, were Christian, and spread their language and religion throughout the empire.
Step-by-step explanation:
After the collapse of the western half of the Roman Empire under the weight of Visigoth and Germanic invasions, the eastern half, known as the Byzantine Empire, survived for another thousand years. It remained intact, albeit under constant military pressure, until 1453. The Byzantines spoke Greek, were Christian, and spread their language and religion throughout the empire.