The Fall of Constantinople

1453 CE — Eastern Mediterranean, Ottoman Empire

Today: Istanbul, Turkey (then Byzantine Constantinople)

For over a thousand years the walls of Constantinople had made it nearly impregnable — until the Ottomans battered them down with enormous gunpowder cannon, extinguishing the Byzantine Empire, the last living fragment of Rome. The blast marked the moment gunpowder rendered the old world of castle walls obsolete. It also cut Europe off from the overland routes east, spurring it to seek a sea path to Asia — the search that would soon send ships across the Atlantic.

Worth knowing: The Ottomans' largest cannon was so huge it took 60 oxen to haul and could fire only a few times a day — but its stone balls, weighing over half a ton, cracked walls that had held for a thousand years.

Pattern: Military-technological disruption — A weapon or tactic upends the prevailing balance of power and renders an old defensive or offensive order obsolete.

Entry 150 of 240 in Precedent, a walk through the whole human story in order.