For everyone's information Constantinople is the Greek name for the city (that's what we use even nowadays), but the Turks are calling it Istanbul. Its international name changed at the beginning of the 20th century from Constantinople to Istanbul, because of the known and unknown diplomatic conspiracies, treaties, wars and assassinations (maybe not the last one).
So, yeah, they call it Constantinople because back then it was part of the Ottoman empire (actually it had just become one. The city was Greek until 1453), but its international name hadn't changed yet.
On topic: I know I won't get it immediately, but I won't exclude some kind of bargain in the future.
PS: Bonus content: The city was called Byzantium before it was renamed as Constantinople when the Roman (yet friend of the Greeks) emperor Constantine moved the Roman empire's capital from Rome to Constantinople. And the Greek-centered Byzantine empire was born...oh, and Italian courts have nothing against the Byzantine conspirators...those guys were vicious...