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The Ubaid period (c. 6500–3800 BC) is a prehistoric period of Mesopotamia. The name derives from Tell al-'Ubaid where the earliest large excavation of Ubaid period material was conducted initially by Henry Hall and later by Leonard Woolley. In southern Mesopotamia the period is the earliest known period on the alluvial plain although it is likely earlier periods exist obscured under the alluvium. In the south it has a very long duration between about 6500 and 3800 BC when it is replaced by the Uruk period. In Northern Mesopotamia the period runs between about 5300 and 4300 BC. It is preceded by the Halaf period and the Halaf-Ubaid Transitional period and succeeded by the Late Chalcolithic period.

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History of research
The excavators of Eridu and Tell al-'Ubaid found Ubaid pottery for the first time in the 1910-20s. In 1930, the attendees at a conference in Baghdad defined the concept of an "Ubaid pottery style". This characteristic pottery of this style was a black-on-buff painted ware. This conference also defined the Eridu and Hajji Muhammed styles. Scholars at this conference thought that these pottery styles were so different that "[...] they could not have developed out of the old, as is the case with the Uruk ware after the al-'Ubaid ware [...]". For many attendants of the conference, "this sequence based largely on pottery represented a series of different 'ethnic elements' in the occupation of southern Mesopotamia." These ideas about the nature of the Ubaid phenomenon did not last. The term Ubaid itself is still used, but its meaning has changed over time.

Joan Oates showed in 1960 that the Eridu and Hajji Muhammed styles were not distinct at all. Instead, they were part of the greater Ubaid phenomenon. She proposed a chronological framework that divides the Ubaid period in 4 phases. Other scholars later proposed phases 0 and 5.

Scholars in the 1930s only knew a few Ubaid sites. These included the type site of Tell al-'Ubaid itself, Ur, and Tepe Gawra in the north. Since then, archaeologists found Ubaid material culture all over the ancient Near East. There are now Ubaid sites in the Amuq Valley in the northwest all the way to the Persian Gulf coast in the southeast. Important research includes the many excavations in the Hamrin area in the 1970s. There, archaeologists found a complete Ubaid settlement at Tell Abada, and a really well-preserved house at Tell Madhur. The excavation at Tell el-'Oueili in the 1980s reveiled occupation layers that were older than those from Eridu. This discovery pushed back the date for the earliest human occupation of southern Mesopotamia.

Excavations along southcoast of the Persian Gulf provided a lot of evidence for contacts with Mesopotamia. The site of H3 in Kuwait, for example, provided the earliest evidence in the world for seafaring. The explosion of archaeological research in Iraqi Kurdistan since the 2010s also led to a lot of new data on the Ubaid. For example, this research showed that cultural links between the Shahrizor Plain and the Hamrin area further south were stronger than those with the north.

Climate and environment
Mesopotamia does not have local, high-resolution climate proxy records such as Soreq Cave. This makes it difficult to reconstuct the region's past climate. Even so, it is known that the environment during the sixth and fifth millennium BC was not the same as today. A more temperate climate settled in around 10,000 BC. Marshy and riverine areas transformed into floodplains and finally river banks with trees. The area south of Baghdad may have been inhabitable by humans in the eleventh millennium BC. Humans could have lived south of Uruk as early as the eighth millennium. This is much earlier than the oldest evidence human occupation in this area. The oldest known site in southern Mesopotamia (Tell el-'Oueili) dates to the Ubaid 0 period. Archaeobotanical research in the Ubaid 0 levels at 'Oueili (6500-6000 BC) has indicated the presence of Euphrates poplar and sea clubrush, both indicative of a wetland environment. As a result of changes in sea-level, the shoreline of the Persian Gulf during the Ubaid was different from that of today. At the beginning of the Ubaid, around 6500 BC, the shoreline at Kuwait may have ran slightly further south. During the subsequent 2.5 millenna, the shoreline moved further northward, up to the ancient city of Ur around 4000 BC.

Date palms were present in southern Mesopotamia since at least the eleventh millennium BC, predating the earliest evidence for domesticated dates from Eridu by several millennia. Date palms require a perennial water source, again indicating that this period may have been wetter than today. Similarly, oak was present from the eighth millennium, but disappeared at around the same time that Ubaid material culture spread outward from southern Mesopotamia during the sixth millennium BC. It has been suggested that acquisition of high-quality wood may have played a role in this expansion.

The available evidence in northern Mesopotamia points to a cooler and drier climate during the Hassuna and Halaf periods. During the Halaf-Ubaid Transitional (HUT), Ubaid and early Uruk periods, this developed into a climate characterised by stronger seasonal variation, heavy torrential rains and dry summers.

Dating and geographical distribution
Ubaid and Ubaid-like material culture has been found over an immense area. Ubaid ceramics have shown up from Mersin in the west to Tepe Ghabristan in the east, and from Norşuntepe and Arslantepe in the north to Dosariyah in the south along the Gulf coast of Saudi Arabia. In this area, researchers have discerned considerable regional variation, indicating that the Ubaid was not a monolithic culture through time and space.

The Ubaid period is most commonly divided in 6 phases, called Ubaid 0-5. Some of these phases equate with pottery styles that were, in earlier publications, considered to be distinct from Ubaid, but that are now considered to be part of the same phenomenon. Some of these styles, such as Hajji Muhammed (previously thought to be Ubaid 2) are now known to occur in Ubaid 3 contexts as well, thereby limiting their value as chronological markers. The relative chronology is based on the long stratigraphic sequences of sites such as Ur, Eridu and Tepe Gawra. The absolute chronology is harder to establish, mainly due to a lack of abundant radiocarbon dates coming from southern Mesopotamia.

Southern Mesopotamia
In the south, corresponding to the area that would later be known as Sumer, the entire Ubaid spans an immense period from ca. 6500 to 3800 BC. It is here that the oldest known Ubaid site - Tell el-'Oueili - was found. In southern Iraq, no archaeological site has yet yielded remains older than Ubaid, However, this might be more a result of the fact that such ancient settlements are now buried deep under alluvial sediments. This was the case, for example, of the site of Hadji Muhammed, which was discovered only by accident.

Central and northern Mesopotamia
In central and northern Iraq, the Ubaid was preceded by the Hassuna and Samarra cultures. The Ubaid may have developed out of the latter. In northern Syria and southeastern Turkey, the Ubaid follows upon the Halaf period, and a relatively short Halaf-Ubaid Transitional period (HUT) dating to c. 5500-5200 BC has been proposed as well. HUT pottery assemblages displayed both typically Ubaid and Halaf characteristics. The relations between these periods - or cultures - is complex and not yet fully understood, including how and when exactly the Ubaid started to appear in northern Mesopotamia. To resolve these issues, modern scholarship tends to focus more on regional trajectories of change where different cultural elements from the Halaf, Samarra, or Ubaid - pottery, architecture, and so forth - could co-exist. This makes it increasingly hard to define an occupation phase at a site as, for example, purely Ubaid or purely Halaf.

In northern Mesopotamia, Ubaid characteristics only start to appear in Ubaid 2-3, i.e. toward the end of the sixth millennium BC, so that the entire Ubaid period would be much shorter. For Syria, a range of 5300-4300 BC has been suggested. However, some scholars have argued that the interaction between the originally southern Mesopotamian Ubaid and the north started already during Ubaid 1-2.

Persian Gulf
Ubaid pottery started to appear along the Persian Gulf coast toward the end of the sixth millennium BC, reaching a peak around 5300 BC and continuing into the fifth millennium. Coastal sites where Ubaid pottery has been found include Bahra 1 and H3 in Kuwait, Dosariyah in Saudi Arabia, and also island sites such as Dalma Island in the United Arab Emirates. Ubaid pottery has also been found further inland along the central Gulf coast at sites like Ain Qannas, suggesting that the pottery may have been traded and valued in and of itself, rather than just being a container for some other commodity. This suggestion is reinforced by locally-produced pottery imiting Ubaid wares found at Dosariyah. It is unclear which products were exchanged for the pottery. Suggestions include foodstuffs (dates), semi-precious materials, jewellery (made from pearl and shell), animal products, and livestock. Notably, the degree of cultural interaction between the Ubaid and local Neolithic communities is much stronger in the area of Kuwait than further south, up to the point that it has been suggested that Mesopotamians may have actually lived (part of the year) at sites like H3 and Bahra 1. Small objects such as labrets, tokens, clay nails and small tools that may have had cosmetic use, and that are known from southern Mesopotamian sites also occur on sites along the Gulf coast, notably the sites in Kuwait.

Conversely, there is also evidence for Arabian Neolithic material in southern Mesopotamia. It has been noted that certain types of flint arrowheads found at Ur show clear resemblance with the Arabian Bifacial Tradition. Arabian Coarse Ware has been found at the sites of 'Oueili and Eridu. As at the sites in Kuwait, it may have been possible that Arabian Neolithic persons lived in southern Mesopotamia.

Architecture
Until the excavations in the Hamrin region, Ubaid architecture was only known from a handful of sites. These included first of all Eridu, where a long sequence of super-imposed temples has been excavated, the equally important houses from the Ubaid levels at Tepe Gawra, and the smaller soundings at Telul eth-Thalathat.

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Pottery
The Ubaid period was first distinguished on the basis of its painted pottery. Ceramics continue to be a main characteristic to determine the chronology and geographical distribution of the period. The paint varies from black to brown, purple and dark green and the pottery fabric itself usually has a buff to red/green brown color. Ubaid 1-2 pottery had dense, geometric and abstract decoration. Later pottery was less decorated, with bands and swags being the most common patterns. The slow potter's wheel became in use during Ubaid 3-4, which may have played a role in the decrease in decoration.

The coarse, plant-tempered, found at many Late and Post-Ubaid sites in northern Mesopotamia from , has been interpreted as some kind of vessel for handing out rations or as evidence of more specialized production, and as such may have been a precursor of the beveled rim bowl from the Uruk period. As with many other aspects of Ubaid material culture, it is possible to distinguish different geographical traditions in the production of the coba bowl during the Ubaid period.

Stone tools
Flint was widely available in Mesopotamia and could be sourced from outcrops in the Zagros and the Jebel Sinjar, from limestone and river terraces in northern Mesopotamia and from alluvial deposits in southern Mesopotamia. Different qualities of flint were used, depending on what kind of tool was made from it. For example, blades were made from a higher quality flint than other tools, and they may have been produced off-site, indicating that not only raw materials but also finished products were transported over larger distances. Flint was used for a variety of tools, including arrowheads, sickle blades, hoes (which are sometimes considered a hallmark of the Ubaid) and a variety of tools for piercing and drilling. Flint assemblages display both regional and temporal variation.

Obsidian was also in use during the Ubaid, although the percentage of obsidian tools that was found at archaeological sites fluctuates widely across Mesopotamia. At sites along the middle Euphrates, only few pieces were usually found, and the number of obsidian artefacts was also limited in southern Mesopotamian sites. At sites along the Khabur and the upper Tigris, obsidian was more common. Also, obsidian seems to have been less common during the Ubaid than during the preceding Halaf period and the subsequent Uruk period. Obsidian could be transported over hundreds of kilometers. For example, obsidian tools found along the Gulf coast at sites such as Dosariyah (Saudi Arabia) and Wadi Debayan (Qatar) came from sources in southeastern Turkey.

The Ubaid may have witnessed a shift in the production of flint tools from being carried out as a domestic activity to a more specialized activity carried out by dedicated craftspeople. This may have been associated with the introduction of Canaanean blade technology, which became common in the 4th millennium BC and may itself have been linked to increased mass-production and intensification of agricultural strategies.

Metallurgy
Evidence for metallurgy comes from several sites in Upper Mesopotamia, all dating to the final stages of the Ubaid period. At Mersin, Level XVI (5000-4900 BC), unalloyed copper pins and chisels were found. At southeastern Anatolian sites like Değirmentepe and Norşuntepe, metallurgical production was practiced during the Ubaid 3, as evidenced by furnaces, and related finds. At late fifth millennium Tell Nader, northern Iraq, kilns were excavated that may have been used for the production of both pottery and metal. Copper objects are also known from the Ubaid levels at Tepe Gawra (XVII-XII) and Tell Arpachiyah. Copper objects were absent in the Ubaid levels at Eridu and 'Oueili, possibly indicating that copper use spread southwards from the north. However, copper may have been traded, as it was present in elite burials of the Susa I (terminal Ubaid) necropolis at Susa east of the Tigris. In general, copper objects seem to be very rare, and gold has not been found at Ubaid sites either.

Wool production
Evidence for the production of wool is ambiguous and mostly indirect. Wool-bearing sheep have been clearly attested in Uruk-period sites, and the domestication of sheep and goat started in the ninth millennium BC, but exactly when wool-production emerged between those two fixed points is unclear. There is some evidence for emerging wool production in the fifth millennium BC, i.e. late Ubaid. Some of the earliest evidence comes in the form of an animal figurine from Iran dated to c. 5000 BC with incised decorations that might possibly represent wool. At Kosak Shamali, an Ubaid site in northern Syria, indirect evidence for wool production has been found in the form of spindle whorls, clay scrapers, and a clay sealing with a cord impression that might have come from rope spun from wool fibers. The animal bone assemblage at this site had a large percentage of domesticated sheep/goat, with changes in the assemblage suggesting that the production of secondary products (such as wool and milk) became more important toward the late Ubaid and the Uruk period. The spindle whorls from Kosak Shamali, and also those from Telul eth-Thalathat II (northern Iraq), gradually decreased in weight, which could indicate that more and more finer-quality or softer fibers were spun.

Stamp seals
Stamp seals had been in use in Upper Mesopotamia since the 7th millennium BC. By the time of the Ubaid period, a wide range of motifs had developed, including geometric patterns and depictions of animals and occasional humans. The Ubaid period saw the first depictions of ibex-headed and bird-headed humans.

Figurines
The majority of Ubaid figurines represented various animals, including sheep, cattle and dogs. Human figurines were already present in previous periods. Those from the early Ubaid reflect a continuation of earlier traditions. A single, painted figurine from the Ubaid 0 levels at Tell el-'Oueili has been interpreted as an early representation of the so-called "ophidian figurines", which became common in the later Ubaid. Both seating and standing figurines were made, with paint being used to detail body parts, clothing, or body modifications. "Ophidian figures" have been exclusively found at various southern Mesopotamian sites. They are characterised by a slender body, long, reptilian head with incised eyes and mouth and a threedimensional small nose. This particular rendering of the face may be a representation of a mask or possibly headshaping. The hands are placed before the stomach, sometimes with incised fingers. They are thought to be naked. Paint is sometimes used to indicate hair or other details. The majority of these figures is female, but male and sexless figurines exist as well. In the earlier Ubaid, ophidian figures were only used in domestic contexts, whereas in Ubaid 3-4, they appear in graves as well, indicating a shift in how these figures were used. The rarity of ophidian figures as grave gifts may indicate differential treatment of the dead, possibly based on age, kinship or social standing.

Burials
The most common burial practice during the Ubaid seems to have been primary inhumation; i.e. burial of the complete body. During Ubaid 4, some 80% (adults) and 94% (infants) of the burials consisted of primary inhumations. The dead were often accompanied by personal adornments such as beads, necklaces, and headdresses. Pots (presumably) containing foodstuffs were also common. Pieces of red ochre have also been recovered from graves. Burials have been excavated at many Ubaid sites, with exceptionally large numbers coming from Tell Abada (127 infant burials) and Eridu (193 burials).

By the fifth millennium BC, children and adults were given differential treatment in death. The available evidence indicates that infants were primarily buried inside the settlement, often near larger, presumably more important dwellings, and often in pots. The association of children's burials with larger buildings is well-illustrated at the sites of Tell Abada and Tepe Gawra. It has been suggested that this pattern of children's burials near larger dwellings was related to increasing social differentiation between kin groups. Adults, on the other hand, were buried at the edge of the settlement in communal burial grounds in pit burials or inside clay boxes. Such burial grounds have for example been excavated at Eridu.

These burial practices represent a clear break from those of the preceding Late Neolithic period. During the Late Neolithic, burials were often secondary and burial treatment was very diverse. The Ubaid witnessed a marked shift toward primary burial, less diverse burial customs, and less diversity in burial gifts. This shift has been interpreted as a reflection of changing perceptions of personhood.

Body modification
Evidence for cranial modification, i.e. deliberate headshaping, among both men and women, has come from many archaeological sites throughout wider Mesopotamia. Where headshaping was detected, it was all of the same type, i.e. one- or two-band circumferential headshaping, which results in an elongated shape of the head. Different types of headshaping were practiced prior to and after the Ubaid period across the Near East, but it seems that the specific technique of circumferential headshaping may have originated in Iran, east of the area of Ubaid influence, and reached its peak during the Ubaid period. It has been interpreted as a marker for socio-cultural group affiliation during the Ubaid.

Labrets and/or ear-spools were likewise recovered from many archaeological Ubaid sites across Mesopotamia and its border regions. In at least one case from southwestern Iran, a labret was found in situ in a burial, located at the mandible of the buried individual and with associated tooth wear indicating that it had been worn. Labrets were absent from Halaf sites in northern Mesopotamia, again indicating that they may have been important markers of socio-cultural identity during the Ubaid. Their use seems to have declined again during the Uruk period.

Subsistence economy
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Agriculture
The modern excavations at Tell Zeidan have revealed a wealth of information on the subsistence economy of a large northern Mesopotamian Ubaid settlement. Cultivated species included barley, wheat, lentil, ervil, and flax. There is some evidence that the inhabitants of Zeidan practiced a form of floodwater irrigation on agricultural lands. The excavators have suggested that the unpredictability of this type of irrigation may have been a factor in increasing social complexity. The relative absence of animal dung, and the common presence of charred wood remains, suggests that wood was used as fuel.

Animal husbandry
Tell Zeidan again provides a wealth of information. The composition of the animal bone assemblage from Zeidan changed considerably from the Halaf to the Ubaid period. During the Halaf, some 50% of the animal bones came from wild species (indicative of hunting), whereas during the Ubaid over 90% represented domesticated species (indicative of herding and keeping animals). Common animals were sheep, goat, cattle, and pigs. A comparison with other Ubaid sites in northern Mesopotamia showed that, in general, pastoralism became more important and reliance on wild fauna decreased somewhat, but this pattern was not as evident at other sites as it was at Zeidan. There was no indication at Zeidan that there was spatial differentiation across the site in how animal products were consumed, suggesting that food stuffs weren't a means to express social differentiation.

Fishing
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Language, ethnicity and genetics
The languages that were spoken during the Ubaid period cannot be determined. Despite the fact that the Ubaid period is prehistorical, it has featured prominently in discussions on the origin and presence of the Sumerian and Akkadian languages in Sumer. This debate has been called the "Sumerian problem" or "Sumerian question". The starting point of this debate was that the oldest cuneiform tablets were written in Sumerian, and that earlier pictographical tablets from the Late Uruk and Jemdet Nasr periods (3200-3000 BC) were likely written in the same language. Based on this evidence, Henri Frankfort proposed in the 1930s that the people who wrote and presumably spoke Sumerian, originally came from the Iranian highlands and settled Mesopotamia at the start of the Ubaid period. Speiser, on the other hand, thought that the Sumerians entered Mesopotamia during the Uruk period and interpreted the regional styles that existed before that time, i.e. Ubaid, Hassuna, Halaf, as evidence of distinct ethnic groups.

More recent discussion has taken a more careful approach, taking pains not to equate pots with people or language with ethnicity. Archaeologists have stressed that a high degree of cultural continuity is evident throughout the Ubaid and Uruk periods, and it seems that there is some agreement that "the relation between three categories, linguistic, racial and ethnic, is exceedingly complex in Mesopotamia and still far from being sufficiently investigated".

Scarce DNA analysis of human skeletal material from various archaeological sites in Upper Mesopotamia (none of which dated to the Ubaid period) provides some evidence for genetic links with other regions, but also provides evidence for continuity in Mesopotamia itself. Most importantly, the dating of genetic influxes that have been detected, has not been refined up to the point that it can be assigned to the Ubaid period - or any other period earlier than the one from which the skeletal material came. In other words, this genetic influx could have happened during the Ubaid - or not.