Revolt of Babylon (626 BC)

Lore & Background

In 626 BC, early in the reign of the Assyrian king Sinsharishkun, the general Nabopolassar exploited political instability from a brief civil war to assault Babylon and Nippur. He won both battles, but the Assyrians quickly recaptured Nippur and besieged him at Uruk. The Assyrian army failed to capture Babylon or kill Nabopolassar, and on November 22/23 626 BC, he was formally crowned King of Babylon, restoring Babylonia as an independent kingdom after more than a century of Assyrian rule.

Sinsharishkun's forces campaigned in northern Babylonia from 625 to 623 BC, initially taking Sippar and defeating Nabopolassar's attempt to retake Nippur. However, other southern cities like Der began to rebel. Sinsharishkun led a massive counterattack, recapturing Uruk in 623 BC. Nabopolassar might have been defeated had a revolt by an unnamed Assyrian general in the western provinces not occurred in 622 BC. That general marched on Nineveh and seized the throne, forcing Sinsharishkun to abandon his Babylonian campaign. Though the usurper was defeated in a hundred days, the Babylonians used the absence to conquer the last Assyrian outposts in Babylonia from 622 to 620 BC, firmly securing Uruk and Nippur.

Reader's Guide

The Revolt of Babylon in 626 BC was a pivotal event that ended over a century of Assyrian domination and led to the rise of the Neo-Babylonian Empire. Nabopolassar's successful consolidation of control by 620 BC set the stage for a prolonged war against Assyria, culminating in the destruction of the Neo-Assyrian Empire twenty years later with the help of Median allies. The revolt also triggered a chain of events, including a usurper's revolt in Assyria's western provinces, which diverted Assyrian resources and allowed the Babylonians to regain lost territory. This rebellion is one of the key factors in the fall of Assyria, demonstrating how internal instability and external alliances can reshape ancient empires. The aftermath saw Nabopolassar expand northward, drawing Egypt into the conflict as a buffer, and ultimately leading to the Medo-Babylonian sack of Nineveh in 612 BC and the final defeat of the last Assyrian king in 609 BC.

Did You Know?

• Nabopolassar was formally crowned King of Babylon on November 22/23 626 BC.
• The revolt was only the last in a long line of Babylonian uprisings against Assyrian rule since 729 BC.
• A revolt by an unnamed Assyrian general in 622 BC forced King Sinsharishkun to abandon his campaign in Babylonia.
• Nabopolassar allied with Cyaxares of the Medes after the Medes had already plundered Assur in 614 BC.

A Century of Subjugation and Repeated Uprisings

Since Tiglath-Pileser III conquered Babylon in 729 BC, successive Neo-Assyrian kings were plagued by what can only be called the 'Babylonian problem' — a persistent cycle of southern rebellions aimed at restoring independence. Even the most extreme measures failed to break the pattern: Sennacherib ordered the outright destruction of the city, and Esarhaddon later undertook its restoration, yet insurrections continued to erupt with each new generation. The 626 BC revolt was therefore not a sudden or isolated event but the latest and most consequential expression of over a century of unresolved tension between the Assyrian north and the Babylonian south. Every Assyrian ruler inherited the same intractable conflict, and every Babylonian generation chafed beneath foreign dominion. This long arc of suppression and resistance forged a political environment in which any flash of Assyrian internal weakness could ignite a full-scale independence movement. In that sense, Nabopolassar's uprising was the culmination of a centuries-old aspiration for self-governance that had been repeatedly crushed but never truly extinguished.

Nabopolassar's Gambit and the 622 BC Turning Point

In early 626 BC, Nabopolassar seized upon a brief civil war between King Sinsharishkun and the general Sin-shumu-lishir to launch a simultaneous assault on the cities of Babylon and Nippur. He emerged victorious in both engagements, but Assyrian retaliation was swift: by October of that year, Nippur had been retaken and Nabopolassar found himself besieged at Uruk. His garrison repelled the Assyrian assault, and on November 22 or 23, 626 BC, he was formally crowned King of Babylon, restoring the region as an independent polity after more than a century of foreign rule. The years that followed brought a grueling struggle for control. Sinsharishkun campaigned in northern Babylonia, recapturing Sippar and retaking Uruk in 623 BC, while other southern cities like Der began rising against Assyrian authority. Nabopolassar's position grew increasingly precarious. His ultimate survival depended on a single fortunate development: in 622 BC, an unnamed Assyrian general revolted in the empire's western provinces and marched on Nineveh, seizing the throne. Sinsharishkun was compelled to abandon his Babylonian campaign. Although he defeated the usurper within a hundred days, his absence allowed Nabopolassar's forces to conquer the last remaining Assyrian outposts in Babylonia between 622 and 620 BC, firmly placing both Uruk and Nippur under Babylonian control.

The Medo-Babylonian War and the Sack of Nineveh

Nabopolassar did not stop at securing independence; he pursued the Assyrians northward with relentless determination. By 616 BC his armies had pushed as far as the Balikh River. Egypt, viewing Assyria as a useful buffer state against the Medes and Babylonians, entered the conflict under Pharaoh Psamtik I. In 615 BC, Nabopolassar failed to take Assur, but the Medes under King Cyaxares struck the region around Arrapha, preparing a final campaign against Sinsharishkun. In 614 BC, combined forces conquered Tarbiṣu and Assur — the ceremonial and religious heart of Assyria — plundering the city and killing many of its inhabitants. Nabopolassar arrived after the sack had already begun and formally allied with Cyaxares in an anti-Assyrian pact. Sinsharishkun's last counterattack to relieve the besieged city of Rahilu found Nabopolassar's army already withdrawn. The final blow came in 612 BC: the combined Medo-Babylonian forces besieged Nineveh from June to August, breached its walls, and subjected the capital to a prolonged, brutal sack. In 609 BC, the last Assyrian king, Ashur-uballit II, was decisively defeated, ending the Neo-Assyrian Empire.

Forging a New Empire from the Ashes

The revolt of 626 BC accomplished far more than the liberation of a single city; it catalyzed the creation of the Neo-Babylonian Empire and set in motion the total destruction of the Neo-Assyrian state. Within four years of his coronation, Nabopolassar had consolidated control over all of Babylonia, ending over a century of Assyrian dominance in the south. Yet the geopolitical consequences extended well beyond the Euphrates. The alliance between Babylon and the Median kingdom under Cyaxares forged a military partnership capable of challenging the most powerful empire of the ancient Near East. Twenty years after the initial revolt, that partnership had annihilated Assyria — first by seizing its religious capital Assur, then by breaching the walls of Nineveh itself. The 'Babylonian problem' that had plagued Assyrian kings for generations was resolved not through suppression or restoration, but through the complete elimination of the Assyrian state. In its place stood a new Babylonian power poised to reshape the political map of the ancient world.