Latest / The Achaemenid Empire: Persia's Golden Age of Power — Fexingo History / Cyrus the Great's Capture of Babylon in 539 BCE
Transcript
- Lucas: So we've talked a lot about Cyrus the Great in earlier episodes — his rise, his capture of Sardis, the foundation of Pasargadae. But the single event that really put him on the map as a world conqueror was the capture of Babylon in 539 BCE. Luna: Right, and Babylon was this massive, ancient city — supposedly impregnable. Lucas: Exactly. It had walls so thick that two chariots could ride side by side on top. The Euphrates ran right through the city. And the king at the time, Nabonidus, had been on the throne for about seventeen years. But here's the thing — Nabonidus was deeply unpopular. He'd spent most of his reign away from Babylon, living in the Arabian oasis of Tayma, leaving his son Belshazzar in charge. Luna: Why would he just abandon his capital like that? Lucas: Partly religious, partly political. Nabonidus was devoted to the moon god Sin, and he promoted Sin above Marduk, the traditional chief god of Babylon. That infuriated the priestly establishment in Babylon. The priests saw Marduk as the city's protector, and they felt Nabonidus had neglected his rituals. Meanwhile, Cyrus was building a reputation as a liberator — he respected local gods, he restored temples. It was a perfect propaganda opening. Lucas: The main source we have for the actual conquest is the Nabonidus Chronicle, a cuneiform tablet that records events year by year. It's fragmentary, but what survives is remarkable. It says that in October 539 BCE, Cyrus fought a battle at Opis, a city on the Tigris, against the Babylonian army. The Babylonians were defeated, and then Sippar fell without a fight. Then, on October 12, the chronicle says: 'Cyrus entered Babylon without battle.' Luna: Wait — without battle? How did he manage that? Lucas: That's the really interesting part. The chronicle says that a Persian general named Gobryas — or Ugbaru in the Babylonian texts — was sent ahead. The river Euphrates was the key. It's believed that Cyrus's army diverted the river upstream, which lowered the water level enough that they could march along the riverbed and enter the city through the river gates. But the chronicle also implies there was betrayal — the gates were left open, or the guards were bribed. Herodotus, writing later, tells the river-diversion story in more detail. Luna: And what about the famous 'writing on the wall' from the Bible? Lucas: Right, that's from the Book of Daniel, chapter five. It describes a banquet held by Belshazzar — Nabonidus's son — during which a hand appears and writes on the wall: 'Mene, Mene, Tekel, Upharsin.' Daniel interprets it as a prophecy of Babylon's fall. Now, the biblical account is more of a moral tale than a historical document — it telescopes events and gets some details wrong, like calling Belshazzar 'king' when he was actually crown prince. But it captures the sense of sudden doom that fell on the city. Lucas: After the city fell, Cyrus presented himself as a liberator chosen by Marduk. The Cyrus Cylinder — a clay barrel inscribed in Akkadian — declares that Marduk looked upon all the lands and chose Cyrus to restore justice. It claims Cyrus entered Babylon peacefully, respected the temples, and allowed deported peoples to return to their homelands, including the Jews. That's all part of a brilliant propaganda campaign to legitimise his rule. Luna: So he turned a military conquest into a PR victory. Lucas: Exactly. And it worked. The Babylonians largely accepted Persian rule. The city remained an important administrative centre. The real significance is that Cyrus now controlled the richest city in the Near East, with access to the Mediterranean and the Persian Gulf. It gave the Achaemenid Empire its economic and symbolic heart for the next two centuries. Lucas: You know, it's worth noting that the whole 'without battle' phrasing might be a bit of spin. There was definitely a battle at Opis, and likely some fighting in the city. But the transition was remarkably smooth compared to, say, Alexander's capture of Babylon almost two hundred years later, which involved a formal surrender. Luna: And Alexander would later use some of the same propaganda techniques, I imagine. Lucas: Absolutely. He presented himself as a liberator too, but he also paid homage to Marduk. Cyrus set the template for how to conquer an ancient civilisation without destroying it. It's a big part of why he's remembered so favourably in both Persian and Western traditions. Lucas: On that note — we don't run ads on these episodes. We keep the show ad-free because we think history should be accessible without commercial interruptions. If you appreciate that, and you'd like to support the work we do, you can find us at buy me a coffee dot com slash fexingo. No pressure at all, but every little bit helps us keep researching and recording. Luna: It's a good model — just people who enjoy the show chipping in. Lucas: Exactly. Now, back to Babylon. One of the coolest details from the Cyrus Cylinder is the list of cities that Cyrus returned their gods to — it mentions Assur, Susa, Akkad, and others. This wasn't just generosity; it was a strategic move to create loyal vassals across the empire. The Jews are just one example, but they were far from the only ones. Luna: Right, and we have the biblical account of the return from exile, but also extra-biblical evidence. Lucas: Yes, the Cyrus Cylinder doesn't mention the Jews specifically, but the policy is consistent. And we have the Elephantine papyri from later centuries that show a Jewish community thriving in Egypt under Persian rule. So the pattern is clear. Luna: It really was a new kind of empire. Lucas: It was. The Achaemenids didn't just conquer; they built a system of governance that respected local traditions while centralising power. The capture of Babylon was the moment that system went from a regional kingdom to a world empire.