"The Migration Period is a name given by historians to a human migration which occurred within the period AD 300–900 in the area which comprises Central Europe."
this was the first result in a GOOGLE search, it's a cute little "nutshell" answer and it might put it into perspective for some of us. I assume this could be used as a decriptive term in conjunction with a timeline when taking into considerations the "area" historians have in mind when using this term....Thomas