Latest / The Achaemenid Empire: Persia's Golden Age of Power — Fexingo History / The Achaemenid Siege of Babylon: Cyrus Takes the City
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- Lucas: Luna, we've talked about a lot of Achaemenid sieges this season — Sardis, Miletus, Bactria — but today I want to go back to the one that arguably made the empire: Cyrus the Great's conquest of Babylon in 539 BCE. Luna: That's the big one, right? The one that really put Persia on the map. Lucas: Exactly. Babylon was the jewel of the ancient world — a massive, walled city on the Euphrates, with a reputation for being impregnable. Cyrus had already taken Media, Lydia, and the rest of the Near East, but Babylon was the prize. Lucas: The king of Babylon at the time was Nabonidus, an interesting figure. He wasn't from the traditional Babylonian royal line — he'd seized power in a coup. And he'd spent years away from Babylon, living in the Arabian oasis of Tayma, which alienated him from the city's powerful priesthood of Marduk. Luna: So the priests weren't on his side. That must have weakened him. Lucas: Hugely. In fact, the Nabonidus Chronicle — a Babylonian text — suggests that the gods themselves had abandoned him. Meanwhile, Cyrus was presenting himself as a liberator, a restorer of proper worship. It's a classic propaganda move. Lucas: The actual military campaign was swift. Cyrus's general, Gobryas — a name that comes up in the Bisotun inscription too, by the way — led the army into Mesopotamia. They met the Babylonian army at a place called Opis, on the Tigris, in September 539. Luna: What happened at Opis? Lucas: It was a decisive Persian victory. The Babylonians were routed. Then Cyrus took the city of Sippar without a fight, and Nabonidus fled. But the real challenge was Babylon itself — with its massive walls and the Euphrates flowing right through it. Lucas: Cyrus used a classic trick: he diverted the Euphrates upstream, lowering the water level so his troops could wade through the riverbed under the city's gates. Herodotus says this happened during a festival, though the Chronicle doesn't confirm that. Luna: So they literally walked into the city through the river. That's incredible. Lucas: It is. And it worked. On October 12, 539, Gobryas entered Babylon without a fight. The city fell almost bloodlessly. Nabonidus was captured, but Cyrus treated him leniently — he sent him into exile rather than executing him. Lucas: Now, this is where the Cyrus Cylinder comes in. It's a clay cylinder found in Babylon in 1879, inscribed in Akkadian, that presents Cyrus's version of events. It says that Marduk, the chief god of Babylon, chose Cyrus to restore order and justice. Luna: So Cyrus was basically claiming divine sanction. Smart politics. Lucas: Absolutely. The cylinder also describes Cyrus's policy of returning cult statues to their original temples and allowing deported peoples to go home. That's the same policy that allowed the Jews to return to Jerusalem and rebuild their temple. Luna: So the famous 'Cyrus the Great as liberator' image comes from that. Lucas: Partly. It's complicated. The cylinder is a piece of propaganda, but it does reflect a real shift in imperial policy. Cyrus presented himself as a legitimate king of Babylon, taking the traditional titles and honoring Marduk. He wanted to be seen as a Babylonian ruler, not a foreign conqueror. Lucas: And it worked. Babylon remained a major city under the Achaemenids, one of the empire's capitals. Alexander the Great would later die there. But the conquest in 539 set the stage for Persia's golden age. Luna: I've always wondered — was there a siege at all? I mean, if they just walked in... Lucas: That's a great question. The word 'siege' might be misleading. There was a battle at Opis, but the capture of Babylon itself was more of a strategic infiltration. The city's walls were never breached. So it's more of a 'technical siege' — a military campaign that ended with the city's surrender without a direct assault. Lucas: Still, the psychological impact was enormous. The Babylonian Empire, which had dominated the Near East for centuries, fell in a matter of weeks. And Cyrus's reputation as a wise and merciful conqueror was cemented. Luna: So what happened to Nabonidus after that? Lucas: He was exiled to Carmania, in southeastern Iran, where he died. His son Belshazzar, who had been co-regent, is mentioned in the Book of Daniel as seeing the 'writing on the wall' — though historically, it's unclear if he died at the fall of Babylon or earlier. Lucas: The conquest of Babylon was a turning point. It gave Cyrus control of Mesopotamia, the Levant, and the trade routes to Egypt. It also provided the Achaemenid Empire with a ready-made administrative system, which they adapted and improved. Luna: And all because they diverted a river. Sometimes the simplest ideas work best. Lucas: True. But it also required intelligence, planning, and the political skill to win over the local elites. Cyrus had all of that. It's no wonder he's remembered as 'the Great'.