Before the Sumerians built their famous city-states, southern Mesopotamia was home to a culture known as the Ubaid, which thrived from roughly 6200 to 4000 B.C. These were not primitive nomads. The Ubaid people built towns, constructed temples, developed early forms of record-keeping, and laid the cultural foundations that the Sumerians would later build upon. Further north, even earlier farming societies like the Hassuna and Halaf cultures were shaping Mesopotamia’s trajectory thousands of years before anyone wrote a single cuneiform tablet.
The Ubaid Culture: Mesopotamia’s First Civilization
The Ubaid period, spanning roughly 6200 to 4000 B.C., represents the earliest known complex society in southern Mesopotamia. Originating on the flat, marshy plains between the Tigris and Euphrates rivers, the Ubaid people developed a distinctive painted pottery style, built multi-room houses in a “tripartite” layout (a central hall flanked by smaller rooms on each side), and established some of the region’s first permanent settlements.
What makes the Ubaid remarkable is the scale of their ambition. Some of their villages grew into genuine towns centered on monumental buildings. At Eridu, considered by later Sumerians to be the world’s oldest city, archaeologists uncovered multiple reconstructions of a temple dedicated to Enki, the god of water and wisdom, built and rebuilt over roughly two thousand years. The earliest layers at Eridu date to the pre-Sumerian Ubaid period (5300 to 3800 B.C.), yet the same deity was worshipped there well into the Sumerian era. This continuity suggests the Sumerians didn’t simply replace the Ubaid people. They inherited from them.
The Ubaid weren’t limited to a few villages, either. Their characteristic pottery has been found along the western coast of the Persian Gulf, likely carried there by fishing expeditions. They produced baked clay figurines, mostly female, with distinctive elongated heads that some describe as lizard-like. They used simple clay tokens that may have served as an early system for tracking goods, and they carved stamp seals with images of snakes, birds, animals, and humans. These seals hint at concepts of ownership and identity that would become central to later Sumerian bureaucracy.
Even Earlier: The Hassuna and Halaf Periods
The Ubaid weren’t the first farmers in Mesopotamia. In the north, the Hassuna culture (roughly 6500 to 6000 B.C.) had already established a mixed agricultural economy with a strong reliance on cereal production. Hassuna villages featured mud-slab houses with three or four rooms, sometimes arranged around courtyards equipped with parching ovens and grain storage bins. These were settled, organized communities that had moved well beyond simple foraging.
Overlapping with and eventually succeeding the Hassuna was the Halaf culture (6500 to 5500 B.C.), which spread across northern Mesopotamia and Syria. The Halaf people are best known for producing some of the finest pottery ever made in the ancient Near East, with intricate painted designs that show a remarkably unified artistic tradition across a wide geographic area. The Halaf period represents a farming society with shared cultural practices but, as far as we can tell, no centralized political authority. It was a world of villages, not kingdoms.
A Language That Left No Texts
One of the most intriguing clues about pre-Sumerian populations comes from the Sumerian language itself. In the mid-20th century, the Assyriologist Benno Landsberger noticed that many basic Sumerian words, particularly names for professions, agricultural tools, and cities, didn’t follow normal Sumerian linguistic patterns. He proposed that these were loanwords borrowed from an older, unidentified language he called “proto-Euphratic.”
The list is striking in its breadth. Words for carpenter, potter, smith, leather worker, weaver, shepherd, fisherman, cook, mason, and gardener all appear to come from this pre-Sumerian layer. So do terms for fundamental agricultural concepts: plow, furrow, date tree, and emmer beer. Even the names of major Sumerian cities, including Ur, Uruk, Larsa, and Lagash, seem to be non-Sumerian in origin. Other scholars pointed out that place names in Ubaid territory, such as Shuruppak and Nineveh, also don’t fit Sumerian linguistic rules.
This linguistic evidence suggests that when Sumerian speakers arrived in or emerged within southern Mesopotamia, they encountered an established population whose vocabulary for farming, craftsmanship, and urban life was already fully developed. The Sumerians absorbed these words because the people already living there had already invented the things they described.
Did the Sumerians Replace or Evolve From These People?
This is the central debate, and the honest answer is that nobody knows for certain. For decades, scholars assumed the Sumerians migrated into southern Mesopotamia from elsewhere, displacing or absorbing the Ubaid population. The linguistic evidence seemed to support this: if Sumerian borrowed so many basic words from another language, perhaps Sumerian speakers were newcomers who adopted local terminology.
Genetic evidence complicates this picture. A study of Y-chromosome and mitochondrial DNA from the Marsh Arabs of southern Iraq, who have long been considered possible descendants of the ancient Sumerians, found that their ancestry is predominantly Middle Eastern. One genetic marker (a branch called J1-Page08) showed a local population expansion roughly contemporary with the rise of Sumerian city-states. The researchers concluded that if the Marsh Arabs descend from the Sumerians, then the Sumerians themselves were most likely indigenous to the region, not migrants from South Asia or the Indus Valley as some older theories proposed.
This raises a fascinating possibility: the transition from “Ubaid” to “Sumerian” may not have been a population replacement at all. It may have been a cultural and linguistic transformation within the same basic population, or at most a blending of local groups with small numbers of newcomers whose language eventually dominated.
What the Ubaid Gave the Sumerians
Regardless of exactly how the transition happened, the archaeological record makes clear that the Sumerians didn’t start from scratch. The temple at Eridu was rebuilt again and again across the Ubaid and Sumerian periods, honoring the same god in the same sacred location. The basic settlement patterns, the irrigation-based agriculture, the use of tokens and seals for tracking goods: all of these were Ubaid innovations that the Sumerians inherited and expanded.
Copper and lead working also preceded the Sumerians. Evidence from northern Mesopotamia places early metallurgy between roughly 6000 and 4000 B.C., overlapping with the Ubaid period. By the time Sumerian civilization hit its stride in the Uruk period (4000 to 3100 B.C.), metalworking was already an established craft with a long regional history.
The Ubaid phase known as “Ubaid 0,” identified at the site of Tell el-Oueili in southern Iraq, pushes the origins of this culture even further back than originally thought, suggesting that complex society in the marshlands of southern Mesopotamia has deeper roots than the traditional chronology allowed. The people who built those first mud-brick villages on the floodplain, who figured out how to farm the difficult alluvial soils and organize their communities around shared temples, created the conditions that made Sumerian civilization possible. The Sumerians are often called the world’s first civilization, but they stood on the shoulders of people whose names we will never know.