The question is: Where do you draw the line? Because if you go back far enough, then "always any territory belonged already to someone else or the ancestors so

The question is: Where do you draw the line? Because if you go back far enough, then "always any territory belonged already to someone else or the ancestors somewhen in time" :-)) So, one might argue the "original borders" are the "true one" at that point when national states started to exist (in fact, the nation/national state is a very young construct, around ~300 years)