The Ancients

Fall of Babylon

November 2, 2025

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  • The fall of Babylon to Cyrus the Great in 539 BC marked the end of the Neo-Babylonian Empire, though the city remained a prestigious and vital center under Persian rule. 
  • The last Babylonian king, Nabonidus, was largely absent, having retreated to Arabia to worship the moon god Sin, leaving his son Belshazzar as regent, a situation that likely facilitated the peaceful takeover by Cyrus. 
  • Cyrus the Great skillfully portrayed himself as an authentic, divinely chosen Babylonian king (the chosen one of Marduk) via propaganda like the Cyrus Cylinder to ensure a harmonious transition of power, contrasting the brutality shown to the nearby city of Opis. 
  • The biblical account of Belshazzar's demise in the Book of Daniel is historically cryptic, likely blending events and figures from different periods, whereas historical sources confirm Belshazzar was killed fighting Cyrus at Opis. 

Segments

Setting the Scene: Glory of Babylon
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(00:05:11)
  • Key Takeaway: Nebuchadnezzar II utilized wealth from his campaigns to transform Babylon into a super city with monumental architecture like the Ishtar Gate and vast walls.
  • Summary: Babylon in the mid-sixth century BC was arguably the largest and wealthiest city the world had yet seen, thanks to Nebuchadnezzar II’s massive building projects. These projects included the final formation of state architecture, such as the processional route and the great ziggurat of Marduk. The city was also a rich, multicultural society, evidenced by the mixture of languages referenced in the Hebrew Bible’s Tower of Babel story.
Rise of Nabonidus via Adad Guppi
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(00:08:31)
  • Key Takeaway: Nabonidus ascended the throne following a gap after Nebuchadnezzar II, largely due to the political maneuvering of his deeply pious mother, Adad Guppi, a devotee of the moon god Sin.
  • Summary: Adad Guppi, who claimed to have been born before the fall of Nineveh, engineered her son’s succession through intense devotion to the moon god Sin, living an ascetic life to secure divine favor. Nabonidus, influenced by this upbringing, began neglecting the traditional duty of Babylonian kings: placating the chief god Marduk during the New Year festival. This religious shift caused Nabonidus to abandon Babylon for voluntary exile in the Arabian oasis of Tema, where he built a temple to Sin.
Belshazzar’s Regency and Cyrus’s Advance
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(00:18:04)
  • Key Takeaway: Belshazzar ruled effectively as regent in Babylon while Nabonidus was in Arabia, but the arrival of Cyrus the Great’s army from the newly conquered Median and Lydian territories posed an unexpected threat.
  • Summary: Belshazzar, whose name honors Marduk, governed competently while his father was away, leading biblical authors to omit Nabonidus entirely and attribute the events to Belshazzar. Cyrus rapidly expanded the Persian Empire, conquering the Medes and Lydia before turning toward Babylon. Cyrus used the brutal sack of the nearby commercial city of Opis, where Belshazzar was killed, as a pragmatic warning to Babylon to surrender peacefully.
Cyrus’s Bloodless Entry and Legitimacy
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(00:29:15)
  • Key Takeaway: Cyrus entered Babylon peacefully after Babylonian nobles defected, immediately establishing legitimacy by adopting Mesopotamian royal titles and claiming divine sanction from Marduk.
  • Summary: Cyrus marched into Babylon without a fight, promising not to harm the people or their gods, and visited the temple of Marduk to solidify his position as the new king. The Cyrus Cylinder portrays him as the chosen champion of Marduk, a narrative likely crafted with the cooperation of the Babylonian religious elite who were dissatisfied with Nabonidus. Cyrus demonstrated political acumen by maintaining existing Babylonian administrators and priesthoods, suggesting the elite welcomed the change.
Post-Conquest Administration and Legacy
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(00:38:02)
  • Key Takeaway: Despite the change in regime, Babylon retained immense prestige under the Achaemenids, who maintained local governance structures and used the city as a key center of royal life.
  • Summary: Cyrus appointed his son Cambyses as regent, notably having him wear Elamite dress in a ceremonial display that hinted at underlying power dynamics rather than pure harmony. Babylon remained the ‘jewel in the Persian crown,’ serving as a winter residence for Persian kings who built their own structures alongside Nebuchadnezzar’s palaces. Although Babylon repeatedly sought independence through rebellions, it retained cultural importance until Alexander the Great also intended to make it the center of his empire.