What role did constantinople play in medieval europe’s economy until the 12th century?

The correct answer to this open question is the following.

The role that Constantinople played in medieval Europe’s economy until the 12th century was of the main hub or center for trade.

In that time, Constantinople, the capital of the Byzantine Empire, was the most important city in the region. Many merchants for all over Europe, Asia, and North Africa, and even India gathered in Constantinople to trade their goods. Constantinople was a modern metropolis for that time that had beautiful architecture and modern services to host such a diverse combination of ethnicities

a politically correct answer.

northernmost part (disputed, administered) - near indira col, siachen glacier - 35.674520°n 76.845245°e

northernmost part (disputed, claimed) - dafdar near beyik pass - 37°24′00″n 75°24′00″e

northernmost part (undisputed) - near dharwas, chambal district - 33.24902°n 76.82704°e

southernmost part (mainland) - cape comorin - 8.06890°n 77.55230°e

southernmost part - indira point in the nicobar islands - 6.74678°n 93.84260°e

distance between:  

1 & 4 - 3070 km

1 & 5 - 3654 km

2 & 4 - 3269 km

2 & 5 - 3885 km

3 & 4 - 2801 km

3 & 5 - 3430 km

explanation:

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others