The Fall of Constantinople

Setting the scene

By 1453, the Byzantine Empire had shrunk to Constantinople and its hinterland after centuries of Ottoman expansion. The city, founded as Byzantium and rebuilt by Constantine in 330 CE, had survived sieges for 1,100 years behind its Theodosian Walls. Sultan Mehmed II, aged 21, had unified Ottoman power and built Rumeli Hisarı fortress to control the Bosphorus. The Byzantines had only 7,000 defenders including 2,000 foreign mercenaries, while the Ottomans could field 80,000.

What happened

Mehmed's siege began April 6, 1453. His Hungarian engineer Orban built a 27-foot bronze cannon that could hurl 600-pound stones, though it cracked and required cooling. After weeks of bombardment, on May 29, Ottoman troops breached the walls near the St. Romanus Gate after a small gate, the Kerkoporta, was left open. Emperor Constantine XI Palaiologos died fighting, his body never identified. Mehmed entered Hagia Sophia and ordered it converted to a mosque.

Why it still matters

The fall ended the Roman Empire after 1,473 years of continuous existence since Augustus, and ended the Middle Ages in traditional historiography. It sent Greek scholars fleeing to Italy with classical manuscripts, fueling the Renaissance. Mehmed made Constantinople, renamed Istanbul, his capital, controlling trade between Europe and Asia. This prompted European powers to seek sea routes to Asia, directly leading to Columbus's 1492 voyage. The city remained Ottoman until 1922, and the Hagia Sophia served as a mosque until 1935.

Background

The event ended the Byzantine Empire. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.