Constantinople faced Persians, Arabs, Bulgars, and countless other enemies, yet the Byzantine capital endured for centuries when so many great cities fell. Discover how the city's mighty walls, the mysterious weapon known as Greek Fire, and generations of military adaptation helped it survive against overwhelming odds. In defending itself, Constantinople preserved Eastern Christianity, classical learning, and the legacy of Rome.

When visitors step inside Hagia Sophia, they enter one of humanity's greatest architectural achievements. But this magnificent building was born from crisis. In the sixth century, Emperor Justinian dreamed of restoring the Roman Empire to its former glory. Together with the formidable Empress Theodora and the brilliant general Belisarius, he came closer than almost anyone in history to rebuilding a lost golden age. Yet his greatest legacy may not have been the territories he conquered, but the laws and ideas that still shape our world today.

Rome had ruled the ancient world for centuries, but its future lay elsewhere. Discover how Emperor Constantine recognized the potential of Byzantium and transformed it into Constantinople, a magnificent new imperial capital whose walls, palaces, churches, Hippodrome, and bustling streets would shape the course of history for the next millennium.