Istanbul
Istanbul then Constantiople but they renamed it Istanbul.
No. It was originally called Byzantion (Latinised into Byzantium).
Istambul, the capital city of Turkey
It was the crossroads between Europe and Asia as well as a Black Sea Port.
There is only one Colosseum. Colosseum is a nickname for what the Romans called the Flavian amphitheatre in the city of rome. The Colosseum was an arena. Roman arenas were/are called amphitheatres. The arena of Constantinople was called the amphitheatre of Constantinople.
Constantinople was the capital city of the Eastern Roman Empire, named so after Constantine the Great. It was not an empire.
Yes, Constantinople was officially renamed Istanbul in 1930. This change was part of a series of reforms in Turkey under Mustafa Kemal Atatürk, aimed at modernizing the country and establishing a distinct national identity. The name Istanbul, which had been in popular use for centuries, reflects the city's rich history and cultural heritage.
Constantinople
The significance of Constantiople was it was Europe's most wealthiest city in in the twelfth century. During a period of disorder, it preserved manuscripts of Latin and Greek authors in libraries. In the thirteenth century, the Italian empire created gold coinage and many of its infrastructure in the city were made of marble in the Middle Ages.
The city of Istanbulhas been settled for three thousand years, first by Thracians about the 12th Century BCE who called it Lygos. The Greeks colonised it in the 7th Century BCE, it was taken over by Rome in 196 CE, and called Byzantium until renamed in 330 CE by Constantine as Constantinople modestly after himself.as the new capital of the Roman Empire.
These are events separated in time and geography. The Battle of Tours in 732 (just 100 years after Mohammed's death) checked the first great wave of Islamic conquest. Constantiople fell to Mehmet (aka Mohammed the Conqueror) in 1453. The effect of that was that many scholars fled West into Europe and helped to spark the Renaissance.