Near the end of the third century, civil war had torn the empire apart and left its borders vulnerable to barbarian invasion. Romans living on the eastern and .\r<br>\r<br>Near the end of the third century, civil war had torn the empire apart and left its borders vulnerable to barbarian invasion. Romans living on the eastern and .\r<br>\r<br>\r<br>\r<br>Near the end of the third century, civil war had torn the empire apart and left its borders vulnerable to barbarian invasion. Romans living on the eastern and .