Technological
Gunpowder
Summary
Invented in China during the 9th century, gunpowder was one of the "Four Great Inventions." Its military applications, particularly in firearms and cannons, spread along the Silk Road and eventually rendered traditional fortifications like castles obsolete. This technological shift dramatically altered the balance of power on the battlefield and was a key factor in the rise of centralized states and empires.
"The villainous saltpetre should be digged out of the bowels of the harmless earth, which many a good tall fellow had destroyed so cowardly."
— William Shakespeare (in Henry IV, Part 1)