Constantinople
Constantinople (; ) was the capital city of the Roman/Byzantine Empire (330–1204 and 1261–1453), and also of the brief Crusader state known as the Latin Empire (1204–1261), until finally falling to the Ottoman Empire (1453–1923). It was reinaugurated in 324 from ancient Byzantium as the new capital of the Roman Empire by Emperor Constantine the Great, after whom it was named, and dedicated on 11 May 330. The city was located in what is now the European side and the core of modern Istanbul.
Constantine XI Palaiologos
Previously serving as regent for his brother John VIII 1437–1439, Constantine succeeded his brother, who died in Constantinople of natural causes in 1448, as Emperor following a short dispute with his younger brother Demetrios. Despite the mounting difficulties of his reign, contemporary sources generally speak respectfully of Constantine. Constantine would rule for just over 4 years, his reign culminating in the Ottoman siege and conquest of Constantinople, the imperial capital, under Sultan Mehmed II. Constantine did what he could to organize the defenses of the city, stockpiling food and repairing the old Theodosian walls, but the reduced domain of the Empire and the poor economy meant that organizing a force large enough for the defense of the city was impossible. Constantine led the defending forces, numbering approximately 7,000, against an Ottoman army numbering around 10 times that and died in the ensuing fighting.