Respuesta :
Because it was the capital of the Byzantine empire and wealth came from trading and its location also helped because it had access to trading routes on sea and by land.
Answer:
Because it was located in the prosperous Bosphorus Strait.
Explanation:
The Bosphorus Strait was an important trade route during the Roman Empire and had a crucial role in the Middle Ages. Constantinople controlled these routes, turning into an important city. Beyond the economical aspects, the geography of the Bosphorus aids Constantinople to avoid attacks. The huge walls protected the city closer to the shores, and might mountains protected the city by its backs.