
ChrisO, Public domain, via Wikimedia Commons
In October 539 BCE, Cyrus the Great conquered the Babylonian Empire in one swift campaign. He defeated the Babylonian army at the Battle of Opis, captured the last Babylonian king Nabonidus, and took the city of Babylon without a battle. The Babylonian Empire thus became part of the rapidly expanding Persian Empire. At least, that is how we usually tell the story. I have often wondered how an empire as powerful and prestigious as Babylonia could fall so easily to a foreign conqueror. But perhaps we have been asking the wrong question.
We know surprisingly little about what actually happened. Our most important contemporary narrative source, the Nabonidus Chronicle, reduces the decisive events to a handful of brief paragraphs. Later Babylonian texts like the Cyrus Cylinder tell us how Cyrus’s new regime wanted his accession to be understood. And Greek authors like Herodotus and Xenophon provide elaborate yet unreliable stories written long after the event. But none of them gives us access to the political calculations taking place behind the scenes.
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