Classical Greece was a high period for city networks, with trading centers dotting the map of the Aegean Sea like “frogs around a marsh” in the words of Aristotle. These were strange times, where Spartans annually declared war on their slaves. Where the Athenian reformer Solon banned the export of vital foodstuffs – on penalty of death – while at the same time laying the groundwork for unprecedented political pluralism. Yet we see an uncommon iteration of city networking that was well ahead of its time. Embedded in the lives of these cities was an early echo of the modern. Athens was the alpha city in a polis system of autonomous city-states that, at its height, spanned from Spain to Africa to the Black Sea with a total population of thirty million people. This was an incredible period of seafaring. Language, culture, aesthetics, and revolutionary political ideas flowed in the currents alongside goods and services in an elaborate trading network. Far from localized cultures of self-sufficiency, most Greek cities depended on trade for basics such as foodstuffs, but also for military, intellectual, and cultural production.