Several reasons actually. The most important one was its location. Thanks to it it enabeled the trade with African, European and Asian countries. Another thing is that it also was a good place to start a war on other countries.
So basically there were two main reasons: military and economic.
Hope it helps you ;)
Constantinople was crucial due to its strategic location as a trade hub, military stronghold, and cultural center. It served as the capital of the Eastern Roman Empire and played a significant role in the interaction between Europe and Asia. Its conquest by the Ottoman Turks in 1453 marked a pivotal point in world history.
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