The country known as Sumer is, by the third millennium the site of at least twelve separate city-states, each comprising a walled city and its surrounding villages and land, and each worshipping its own deity, whose temple is the central structure of the city.

Sippar (present Abu Habba), located twenty miles (thirty-two kilometers) southwest of present Baghdad, Iraq, is probably occupied before 3000.

Given that thousands of cuneiform tablets have been recovered at the site, relatively little is known about the history of Sippar.

As was often the case in Mesopotamia, it was part of a pair of cities, separated by a river.

Sippar was on the east side of the Euphrates, while its sister city, Sippar-Amnanum, was on the west.

While pottery finds indicate that the site of Sippar was in use as early as the Uruk period, substantial occupation occurred only in the Early Dynastic period of the third millennium BCE.

The five "first" cities said to have exercised pre-dynastic kingship are Sippar (Tell Abu Habbah), …

…Shuruppak (Tell Fara), …

…Larsa (Tell as-Senkereh), …

…Eridu (Tell Abu Shahrain), and …

…Bad-tibira (probably Tell al-Madain). 

According to the Sumerian King List, Bad-tibira was the second city to "exercise kingship" in Sumer before the flood, following Eridu.

These kings were said to be En-men-lu-ana, En-men-gal-ana and Dumuzid the Shepherd.

The early Sumerian text known as Inanna's descent to the netherworld mentions the city's temple, E-mush-kalamma.

In this tale, Inanna dissuades demons from the netherworld from taking Lulal, patron of Bad-tibira, who was living in squalor.

They eventually take Dumuzid king of Uruk instead, who lived in palatial opulence.

This Dumuzid is called "the Shepherd,” but on the King List, Dumuzid the Fisherman reigns in Uruk some time after the flood, between Lugalbanda and Gilgamesh.

The hierarchy of the gods grows more stratified, paralleling Mesopotamian society.

Recognizable class divisions and royal dynasties appear in Sumer consolidating women's exclusion from politics, although women, according to class position, continue to exercise varied roles and to enjoy some legal protection for property.

The Middle East: 2061–1918 BCE

Invasions, Cultural Synthesis, and Urban Transformation

Collapse of Ur III and the Rise of Elam

Between 2061 and 1918 BCE, the Middle East witnessed pivotal transformations. The combined attacks of the Amorites, Semitic peoples from the west, and the Elamites, originating from southwestern Iran, culminated in the fall of the Third Dynasty of Ur by around 2000 BCE. Despite their military victory, these invaders carried forward the Sumero-Akkadian cultural legacy. By 2000 BCE, Elam had achieved sufficient unity and strength to sack Ur, marking the beginning of a rapid cultural ascent and regional influence.

Amorite Expansion and Cultural Integration

The Amorite migration, triggered by drought conditions in the late third millennium BCE, significantly reshaped the demographic landscape. Large numbers of these Semitic-speaking nomads entered and dominated regions including Canaan and Mesopotamia. Their influx into Babylonia, the mid-Euphrates, and Syria-Palestine resulted in numerous small kingdoms that integrated and sustained Sumero-Akkadian traditions. This period set the stage for powerful Amorite kingdoms, eventually culminating in the prominence of Babylon under Hammurabi.

Amorite Identity and Settlement Patterns

The Amorites, or Mar.tu, featured prominently in early Sumerian texts, initially associated with western territories including Syria and Canaan, though their original homeland remains debated—ranging from the broad expanse between the Euphrates and Mediterranean to more limited areas such as Jebel Bishri in modern Syria. Their culture notably incorporated worship of the moon-god Sin and the deity Amurru.

Urban Flourishing and Interaction with Egypt

Bronze Age urban centers thrived, maintaining active trade networks that extended to Egypt, which held a dominant presence in the Jordan Valley. This urban prosperity declined after 2000 BCE due to Amorite migrations. In Syria and Canaan, Amorite culture blended closely with indigenous Hurrian populations, creating a vibrant, interconnected civilization. Early diplomatic and trade contacts between Ugaritic cities and Egypt date specifically to the reign of Pharaoh Senusret I (1971–1926 BCE), evidenced by archaeological finds such as a distinctive carnelian bead.

Commercial and Legal Developments

The city-state of Eshnunna flourished as a key commercial hub due to its strategic location on major trade routes connecting Mesopotamia with Elam. Exotic goods, including horses from northern regions and precious metals and stones, flowed through this gateway city. Notably, early codifications of law such as the Code of Ur-Nammu (circa 2050 BCE) and the Code of Eshnunna (circa 1930 BCE) formalized economic relationships, introducing monetary fines, compensation standards, and regulated interest rates.

The Enigma of Dilmun

Dilmun, an important maritime trade center described in Sumerian texts as "the Land of the Living," retained its significance into the early second millennium BCE. Despite its prominence in ancient literature—including the Epic of Gilgamesh—archaeological evidence for Dilmun’s exact location during this period remains uncertain. Various proposals situate Dilmun around modern Bahrain, Failaka, or possibly an unidentified location near the Shat al-Arab, aligning better with ancient descriptions.

Urban and Religious Developments

Mesopotamian cities, notably Ur, became architectural marvels. Ur, housing approximately sixty-five thousand people around 2030–1980 BCE, surpassed Lagash as the largest urban center. It featured elaborately designed ziggurats dedicated to lunar deities, built with vibrant glazed bricks. Concurrently, Gilgamesh, legendary king of Uruk, was immortalized in humanity's first great poem, the Epic of Gilgamesh, composed around 2000 BCE.

Assyria: Emergence of a New Power

In northern Mesopotamia, the cities of Assur, Nineveh, and Irbil defined early Assyria. Although initially under Akkadian and later Sumerian influence, Assyria gained independence in the late twenty-first century BCE. Early kings, such as Tudiya—who interacted diplomatically with Ebla—transitioned from nomadic to urban leadership, establishing a stable monarchy by about 1930 BCE under Ushpia, contemporaneous with Ishbi-Erra of Larsa.

Majan and Wider Trade Networks

The kingdom of Majan (likely modern Oman) was integral to interregional trade, supplying valuable copper and diorite. Trade relations, disrupted during Gutian domination, resumed vigorously under the Ur III dynasty, reinforcing Mesopotamia's commercial links with distant lands such as Zanzibar and South Asia.

This era, thus, represents a transformative period marked by cultural integration, extensive trade networks, urban sophistication, and the emergence of enduring civilizations across the Middle East.

Among the wide range of views regarding the Amorite homeland, the more extreme of these is the view that kur mar.tu/m t amurrim covered the whole area between the Euphrates and the Mediterranean, Arabia included.

The other extreme is the view that the “homeland” of the Amorites was a limited area in Syria (Jebel Bishri).

One minority theory refers to Arabia in general as the area from where the Amorites once came.

Another refers to a limited area (unknown) in Arabia, the mountain district of Martu.

However, as the Amorite language is a northwestern Semitic language, it is likely that they originated from what is now modern Syria.

A large-scale migration of federated Amorite tribes, likely triggered by the twenty-second century BCE drought, infiltrates Mesopotamia from the west from the twenty-first century BCE, resulting in the occupation of Babylonia proper, the mid-Euphrates region, and Syria-Palestine.

They set up a mosaic of small kingdoms and rapidly assimilate the Sumero-Akkadian culture.

They are one of the instruments of the downfall of the Sumerian Third Dynasty of Ur, and acquiring a series of powerful kingdoms, culminate in the triumph under Hammurabi of Babylon.

The land of the Amorites ("the Mar.tu land") is associated in the earliest Sumerian sources, beginning about 2400 BCE, with the West, including Syria and Canaan, although their ultimate origin may have been Arabia.

The ethnic terms Amurru and Amar were used for them in Assyria and Egypt respectively.

Amorites seem to have worshipped the moon-god Sin, and Amurru.

The Semitic-speaking Amorites, who penetrate Canaan from the northeast, become the dominant element of the population.

In Syria as well as in Canaan, the Amorite newcomers thoroughly mix with the Hurrians; their civilization is intimately connected with that of the towns of the Phoenician-Canaanite coast.

The pharaohs give costly gifts to those princes, such as the rulers of Qatna and ...