Is it ok to use the following real places in a complete fiction story?
Verseilles, Delphi, Athens, Persia, Crete, Pompeii, Mohenjo-daro, Vaishali, Maratha, Kosala, etc.

I am writing a fiction novel about a central unreal empire, lets call it A, where they have relations with (currently) Verseilles, Persia, Athens, Pompeii and Maratha. The stories do not entirely happen there. They are involved but the main plot happens in A. Is it ok to use history in created fiction?