1453 was the most shocking year in Europe since the starting of the Bubonic Plague (1347), the beginning of the First Crusade (1095), or the crowning of Charlemagne as Holy Roman Emperor in 800. Many called it the Year the Middle Ages ended. That’s because the Ottomans, an upstart empire less than two centuries removed from being a semi-nomadic chieftainship and vassal state of the Mongols, conquered Constantinople, the crown jewel of eastern Christendom and the “still-beating heart of antiquity”