Did 'Greece' exist a concept since the founding of the first set of republics through to modern day Greece?

by dansta92

Sorry if my word choice is poor but as I understand Greece is a very new country with a VERY turbulent recent history. But after the original Greece existed and after the Romans / Byzantines (so Romans) then Ottomans inhabited the modern day land of Greece for millennia has the idea of 'Greece' existed for all this time? Or is it a new construct used to foster nationalism and power.

cchiu23