Sure I'll give you a tibbit...
One group, who in part can claim that they killed off the Roman Empire are the Huns, under Attila. They swept across Russia and pushed Germanic tribes like the Visigoths, Ostrigoths, and Vandals into Roman lands. Legend has it that Pope Leo the first disarmed Attila with only his words. The reality is that Attila knew that if he took Rome he would need to contend with the massing combined forces of Rome and the Germanic Tribes. With all this pressure of her boarders, Rome had only one choice, to let in the barbarian refugees. After a generation, ˝ the army was of German-born descent. Being Roman just was not a big deal anymore. Eventually, Germans had so integrated into Roman culture that people forgot they were there. Romans adopted German names and dress and vice-versa.
However, some historians say that the great empire survived in the form of the Byzantine Empire. The king of the empire and his people called themselves Romans. Therefore, if this is to be believed, then the Roman Empire did not fall until 1453.