Answer:
a. Byzantium
Explanation:
The city of Constantinople was established in what was previously known as Byzantium (and is now Istanbul). Byzantium became the capital of the Eastern Roman Empire in 324, becoming Constantinople in 330, named after Emperor Constantine. Constantinople was the largest and wealthiest city in Europe for much of its history, and it exerted a powerful influence on European life and culture for over a hundred years. The city was also instrumental in the development and advancement of Christianity.
