The Roman denarius
Rome introduced the silver denarius during the First Punic War. Remarkably stable for 400 years before being progressively debased from the 3rd century onward. It became the dominant coinage across the Mediterranean, the Near East, and as far east as India. Roman fiscal documents from the first century AD price everything from legionary salaries to imported silk in denarii.
The word 'dinar' in several modern currencies (Jordan, Iraq, Serbia, Bahrain, Algeria) descends directly from 'denarius'. The purchasing power of one silver denarius in 100 AD was roughly a day of skilled labor, a ratio that held across much of the Roman world for centuries.
02 · Coined Metal
Money became portable, durable, and unforgeable (in theory) when sovereigns started stamping their seal onto standardized metal. Lydia minted the first coins in the 7th century BC. Within two hundred years, coinage had spread from the Aegean to India to the Yellow River. Trust moved from the object to the ruler who minted it.
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