Old Babylonian History and the First Dynasty

Babylon’s First Dynasty transformed a small central Mesopotamian kingdom into the leading power of the southern river plain. Its best-known king, Hammurabi, joined diplomacy to conquest and brought rival capitals under his rule. His successors inherited a large but vulnerable realm: rebellion and territorial losses eventually reduced it to a smaller kingdom around Babylon. Dates here follow the Middle Chronology, which places Hammurabi’s reign in 1792–1750 BCE and the Hittite sack ending the dynasty around 1595 BCE. Other chronological schemes assign different absolute dates to these second-millennium events.

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Babylon’s rise among competing kingdoms

The dynasty’s origins are conventionally placed around 1894 BCE and associated with Sumu-abum. Babylon was then one of many political centres competing after the collapse of the Third Dynasty of Ur. Its neighbours included Isin and Larsa to the south, Eshnunna in the Diyala region to the east and Assyrian rulers farther north. Elam, east of Mesopotamia, also intervened in this political world. Royal year names, labels that dated a year by a memorable royal act, record wall building, temple work and victories. They linked routine documents to a ruler’s public achievements.

Sumu-abum and his successors gradually strengthened the kingdom. Sumu-la-El completed a defensive wall at Babylon, and later rulers undertook further wall and canal projects. Sin-muballit, Hammurabi’s father, is among the early dynasty’s rulers identified as king of Babylon. These projects and titles point to a growing royal centre, but Babylon remained one contender among several, rather than the uncontested capital of southern Mesopotamia.

Hammurabi’s alliances and expansion

Hammurabi inherited this smaller kingdom in 1792 BCE. His rise depended on both diplomacy and warfare. Rulers made agreements, exchanged letters and formed alliances, but these relationships could change as their interests shifted. The archive from the palace at Mari, whose king Zimri-Lim was an ally of Hammurabi for part of this period, preserves correspondence about diplomacy, oaths and military affairs. Envoys carried reports between courts, allowing a king to learn which allies were ready to send troops and which rivals were manoeuvring against him.

Hammurabi’s victories brought major cities and their surrounding territories under Babylonian control. He defeated Larsa and Eshnunna and took Mari, extending his influence across much of southern and central Mesopotamia. Cities such as Nippur, Ur and Uruk mattered not only as political centres but also as hubs within networks of trade and settled agricultural communities. Control of these places gave Babylon access to routes and resources that its earlier rulers had not commanded. Hammurabi’s achievements made Babylon the leading power in the region, although that unity proved temporary.

One Mari letter reports a message from Rim-Sin of Larsa to Hammurabi about promised soldiers. Rim-Sin explained that he had kept his troops ready because he thought the enemy was moving elsewhere; he offered help if Babylon was attacked and expected Babylonian assistance if the threat turned towards Larsa. The exchange shows alliance as a practical negotiation over when troops would move. These two kings later became opponents, and Hammurabi took Larsa in 1763 BCE. Victory transferred not only a capital but the productive southern lands attached to it.

Royal government, law and religious authority

Hammurabi’s enlarged realm required more than military victories to hold it together. His government relied on central authority, taxation and a bureaucracy, while royal building projects included canals and defensive works. These measures connected the king’s authority to the cities and districts he governed. When territory changed hands, control of towns, routes and productive land changed with it; communities that had once answered to rival courts now faced Babylonian rule.

Letters make the work of governing these lands concrete. Hammurabi ordered Sin-iddinam to clear silt and vegetation from the Euphrates channel between Larsa and Ur. Another instruction directed Shamash-hazir to open channels towards marshland when the river ran dangerously high. Clearing a blocked channel allowed water to reach downstream users; diverting a flood could reduce pressure on settled and cultivated areas. Officials had to mobilize people at the right time, so an order from the palace depended on local supervision and labour.

The legal collection similarly joins resources to responsibility. A soldier’s service holding supported him and his family while placing a duty on him to serve the king. Field leases and irrigation provisions concerned who cultivated land, who received the harvest and who compensated neighbours for avoidable damage. Royal authority reached into these arrangements through officials, contracts and judgments, alongside the king’s larger claims to have established justice.

The stele known as the Code of Hammurabi presents royal justice as a duty granted by the gods. Its relief shows the king before Shamash, the sun god associated with justice, and its written provisions set out rulings and standards for conduct. Its legal cases address disputes that affected livelihoods, including negligent irrigation, loans, hired work and family property. Hammurabi’s inscriptions also invoked Marduk, Babylon’s chief god, linking the authority of the city and its king to divine favour.

Akkadian served as the official written language, while Sumerian continued in literary and religious traditions even though it was no longer an everyday spoken language. This combination allowed officials to administer current affairs in Akkadian while scholars and priests continued to use an inherited body of Sumerian works.

A reduced kingdom with continuing urban life

After Hammurabi’s death, his son Samsu-iluna faced revolts and the loss of important territories. Independent Sealand rulers controlled parts of the southern plain, while settlements including Ur and Uruk experienced disruption and abandonment. Losing a district meant losing access to its harvests, labour and routes, as well as the authority to appoint or supervise its officials. Babylonia continued as a kingdom centred on Babylon, but it no longer commanded the broad network of cities and districts that Hammurabi had united.

The later kings continued to date documents, maintain institutions and present building work as service to the gods. Private correspondence and contracts from the seventeenth century BCE show that households still bought, borrowed and managed property within this smaller political setting.

The Hittite sack of Babylon

The first dynasty ended when the Hittite king Mursili I attacked and sacked Babylon around 1595 BCE, during the reign of Samsu-Ditana. The Hittites carried away the images of Marduk and his consort from Babylon’s temple. A later Kassite royal inscription credits a Kassite king with returning the images, a claim that also shows how restoring the city’s divine symbols became part of the story of legitimate rule. The Hittite attack was brief, but it brought the First Dynasty to an end and opened the way for Kassite rule.