The Delian League: Ancient NATO?

March 26, 2026·1 hr 6 min·4 clips

Thucydides calls Naxos the first city 'to be enslaved by the Athenians.'

1. The Ancients episode focuses on the Delian League, an alliance of Greek cities often compared to “the ancient history version of NATO.” 2. Tristan Hughes hosts the discussion, and Professor Polly Lowe of the University of Durham explains ancient Athenian imperialism and the growth of the Delian League. 3. The episode asks whether the Delian League was a genuine alliance, a security pact against Persia, or the beginning of the Athenian Empire. 4. Lowe dates the league’s creation to 478-7 BCE and links it to the Persian Wars, including Marathon and the larger invasion of 480-79 BCE. 5. The Spartans withdraw from the earlier anti-Persian alliance, and Thucydides presents the Delian League as a continuation of that coalition minus Sparta and a few Peloponnesian states. 6. A later source attributed to Aristotle gives a different origin story, which makes the league’s foundation harder to pin down. 7. The league took its name from Delos because Thucydides says the Greek states met there, rather than in Athens. 8. The alliance initially faced the question of whether members would contribute ships or money. 9. Lowe says the money option mattered because Athens could build and crew the fleet itself, which concentrated military power in Athenian hands. 10. The league’s early campaigns targeted Persian-held territory in places such as Aion, which sat at the mouth of an important river and controlled timber and access inland. 11. Thucydides also mentions operations in western Anatolia and the battle at the Eurymedon River, showing that the league kept fighting Persia in the 470s and 460s BCE. 12. Lowe notes that Athens may have been using anti-Persian warfare as a pretext for securing strategic positions around the Aegean and routes toward the Black Sea. 13. Naxos and Thassos are the clearest examples of cities that tried to leave and were forced back into the league by Athens. 14. Thucydides calls Naxos “the first city to be enslaved by the Athenians,” using language usually applied to Persian domination. 15. By the late 450s, inscriptions show that only Chios, Lesbos, and Samos were still contributing ships, while most other members were paying money. 16. Lowe stresses that historians cannot tell how much of this shift was negotiated, imposed, or accepted as a practical choice by smaller communities. 17. Around 454 BCE, the league’s treasury moved from Delos to Athens, with the money stored on the Acropolis in the Parthenon. 18. Lowe says that move can be read as a security measure, but many historians treat it as a symbolic transfer of the league’s center to Athens. 19. The Egyptian expedition shows the scale of Athenian ambition, with Inaros asking Athens to join a rebellion against the Persian Empire. 20. The episode suits listeners interested in Greek history, Athenian power, and the mechanics of empire, but it may not suit anyone wanting a short, light overview only.

As heard by us

A careful look at ancient power politics that keeps the NATO analogy honest.

The episode treats the Delian League as a rough NATO parallel, then keeps pulling that comparison apart with the record. It looks at who signed up, who tried to leave, and how Athens handled resistance, while keeping the source problem in view.

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Want ancient alliance politics with a modern frame?

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