Constantinople was more advanced because it thrived even when the western part of the Roman Empire fell. It was quite possibly the most advanced part of Europe at that time, while Western Europe was in complete disarray.
There have been many sieges of Constantinople. You will have to be more specific.
One Opinion:My own view is that depending on the time in the Middle Ages and what is meant by advanced, the most advanced cities in Europe were probably Constantinople, Cordoba, Paris, London, and Lübeck. Other people will have other opinions.
They were more advanced because they had more medical people and were much more advanced in technology.
Advanced math
The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.The Romans ad a more advanced civilization than the barbarians.
Constantinople
Squid are considered more advanced than clams.
Constantinople was in Greece.
Roman architecture focused on creating inside spaces and practicality. Greek architecture as seen in Constantinople was more ornate and focused on the outside.
The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.The ancient city of Constantinople has morphed into Istanbul.
constantinople was not a religion but a city.
I think I will travel to Constantinople.