The town of Istanbul had many names in all its history, according to the culture, the language, and the religion of its rules. Byzance, Constantinople, Stamboul and Tsarigrad are examples which can still be found in the active use in certain countries. Between others, this was called New Rome or in the second place Rome, since the Roman emperor Constantine large founded him on the site of the ancient town of Greek of Byzance like in the second place, and definitely the Christian, capital of the Roman empire, contrary to the mainly pagan Rome distiller.

It was also called 'the city on seven hills' because the historical peninsula, the oldest part of the city, was built by Constantine on seven hills with the match the seven hills of Rome.

The hills are represented in the coat of the city of the arms with seven mosques, one with the top of each hill. Another old nickname of Istanbul east Vasileousa Polished (queen of the cities) due to its importance and richness throughout the average ages. With the Turkish law of mail service of March 28, 1930, the Turkish authorities officially invited foreigners to cease mentioning the city with their names traditional not-Turks (such as Constantinople, Tsarigrad, etc) and to also adopt Istanbul like single name in their own languages.

Letters or the packages sent to 'Constantinople' instead of 'Istanbul' were not provided any more by PTTs of Turkey, which contributed to the unquestionable world adoption of the new name. In the same way, of the letters or the packages which were sent to 'Smyrna' instead of Izmir, 'Ankara' instead of Ankara, of 'Trebizond' instead of Trabzon, and other ancient names of city were not delivered any more; a measurement which forced the fast world identification of the modern names Turkish of each city ahead in the country.