Taking about the Migration, there is more indications that there was Emigration from the East Roman Empire to the Lands of the
Consequently there was a constant stream of emigration
not only to the land of the barbarians but to places farthest remote from
the Romans;and in every country and city one could see crowds of foreigners. For in order to escape persecution, each would lightly exchange his native land for another, as if his own
country had been taken by an enemy.