I think we have to make difference between:


Ελλάδα, Elláda

and

Greece.

We have to understand that hellinic and greek are not national designations, but religional.

So we have title-designation "greek" not only for Romaion imperator but also for Serbian, Bolgarian, Georgian adn Russian tsars-kings-imperator.

Russia proposed to create a Greek state in XIX cent. in the religional meaning - ortodox state.

And certainely the modern greek and old greek languages are absolutely different.