Ottomans Capture Constantinople Ending Byzantine Empire
By the mid-15th century, the once-vast Byzantine Empire had shrunk to little more than the city of Constantinople itself, surrounded by Ottoman territories after decades of expansion under sultans like Murad II. Sultan Mehmed II, determined to claim the strategic city at the crossroads of Europe and Asia, assembled a massive army and navy and launched a siege in April 1453 that lasted nearly two months. Ottoman forces employed innovative siege cannons, including massive bombards designed by Hungarian engineer Orban, to batter the ancient Theodosian Walls. On May 29, after a final assault that breached the defenses, Ottoman troops overwhelmed the city despite fierce resistance led by Emperor Constantine XI. The emperor perished in the fighting, and the Ottomans looted the city for three days as was customary. Mehmed II entered in triumph, converting Hagia Sophia into a mosque and establishing Constantinople—renamed Istanbul—as the new Ottoman capital.
Why it matters: The conquest ended the last remnant of the Roman Empire after more than 1,500 years and shifted the balance of power in the eastern Mediterranean decisively toward the Ottomans. It prompted waves of Greek scholars to flee westward, carrying classical texts that fueled the Renaissance in Europe. The event also closed a major trade route to the East, spurring European powers to seek alternative sea routes that would lead to the Age of Exploration.