the conquered city of constantinople became the capital of which empire
Fall of Constantinople The capture of Constantinople (and two other Byzantine splinter territories soon thereafter) marked the end of the Byzantine Empire, a continuation of the Roman Empire dating to 27 BC, an imperial state lasting for nearly 1,500 years.[25] The Ottoman conquest of Constantinople also dealt a massive blow to Christendom, as the Muslim Ottoman armies thereafter were left unchecked to advance into Europe without an adversary to their rear. After the conquest, Sultan Mehmed II transferred the capital of the Ottoman Empire from Edirne to Constantinople.