This whole idea has caused immense numbers of wars.
For instance, who has "title" to most of the Balkans?
At various times, Serbian, Bulgarian, Greek, Turkish and assorted other nationalities had empires which controllled the same areas. So who has the "right" to them?
Historical claims are a giant worldwide can of worms. The only logical approach that will prevent fighting is to allow the present inhabitants to vote and abide by the results.
Missed one out, but hey nobody's perfect.
The annual "blood levy" of Christian boys in peacetime was a novelty even by the Arabian standards. In Arabia those families unable to pay the crushing jizya were obliged to hand over their children to be sold into slavery, and to deduct their value from their assessment. But Turkish "devshirme," introduced by Sultan Orkhan (1326-1359), consisted of the periodic taking of a fifth of all Christian boys in the conquered territories:
On a fixed date, all the fathers were ordered to appear with their children in the public square. The recruiting agents chose the most sturdy and handsome children in the presence of a Muslim judge... The devshirme was an obvious infringement of the rights of the dhimmis-a reminder that their rights were far from secure, once and for all.
A NEW CENTURY OF CHRISTIAN MARTYRDOM: THE UNTOLD MIDDLE EASTERN CRISIS
Are you aware that it is highly debatable whether there is much genetic connection from the ancient Hellenes to the modern Greeks? Most of the modern inhabitants of Turkey are probably as genetically "Greek" as the inhabitants of modern Greece.
Well Sherlock, are you really sure how could that be?
Don't you think they liked their culture and themselves just fine before the Turkish encounter? Isn't this just proving the point, with the Turkish enslavement? Now do you call that civilised? A nice display of culture at it's finest, I suppose you'd say. Just like the nazi's Lebensborn program when they took women from occupied territories to breed children from. They also managed to vacuum-clean the same territories for blond children, who were given an id-number and to this date don't know their real identity. Wonder, whether they also were to be modern day janissaries and scholars for the Reich, just like the poor souls did, ending up for the Turks before them. Clearly shows the excellence, élan of culture and tolerance.