What was the capital city of the Byzantine Empire, later renamed by the Ottomans?

The capital city of the Byzantine Empire was Constantinople, renowned for its strategic location and rich history. Founded by Emperor Constantine the Great in 330 AD, it served as the eastern capital of the Roman Empire before becoming the center of the Byzantine Empire. In 1453, when the Ottomans, led by Sultan Mehmed II, conquered the city, they renamed it Istanbul. This renaming marked a significant shift in power and culture, as the city became the capital of the Ottoman Empire and a pivotal hub for the Islamic world. The historical significance of Constantinople as a center of trade, culture, and politics further solidifies its importance in world history, which is why it is the correct answer in this context.