According to the SKL, Uruk was founded by the king Enmerkar. Though the king-list mentions a father before him, the epic Enmerkar and the Lord of Aratta relates that Enmerkar constructed the House of Heaven (Sumerian: e2-anna; cuneiform: 𒂍𒀭 E2.AN) for the goddess Inanna in the Eanna District of Uruk. In the Epic of Gilgamesh, Gilgamesh builds the city wall around Uruk and is king of the city.

Uruk went through several phases of growth, from the Early Uruk period (4000–3500 BC) to the Late Uruk period (3500–3100 BC).[1] The city was formed when two smaller Ubaid settlements merged. The temple complexes at their cores became the Eanna District and the Anu District dedicated to Inanna and Anu, respectively.[1] The Anu District was originally called 'Kullaba' (Kulab or Unug-Kulaba) prior to merging with the Eanna District. Kullaba dates to the Eridu period when it was one of the oldest and most important cities of Sumer. There are different interpretations about the purposes of the temples. However, it is generally believed they were a unifying feature of the city. It also seems clear that temples served both an important religious function and state function. The surviving temple archive of the Neo-Babylonian period documents the social function of the temple as a redistribution center.

The Eanna District was composed of several buildings with spaces for workshops, and it was walled off from the city. By contrast, the Anu District was built on a terrace with a temple at the top. It is clear Eanna was dedicated to Inanna from the earliest Uruk period throughout the history of the city.[2] The rest of the city was composed of typical courtyard houses, grouped by profession of the occupants, in districts around Eanna and Anu. Uruk was extremely well penetrated by a canal system that has been described as, "Venice in the desert."[3] This canal system flowed throughout the city connecting it with the maritime trade on the ancient Euphrates River as well as the surrounding agricultural belt.

The original city of Uruk was situated southwest of the ancient Euphrates River, now dry. Currently, the site of Warka is northeast of the modern Euphrates river. The change in position was caused by a shift in the Euphrates at some point in history, which, together with salination due to irrigation, may have contributed to the decline of Uruk.

Archaeological Levels of Uruk

Archeologists have discovered multiple cities of Uruk built atop each other in chronological order.[4]

Uruk XVIII Eridu period (c. 5000 BC); the founding of Uruk Uruk XVIII-XVI Late Ubaid period (4800–4200 BC) Uruk XVI-X Early Uruk period (4000–3800 BC) Uruk IX-VI Middle Uruk period (3800–3400 BC) Uruk V-IV Late Uruk period (3400–3100 BC); The earliest monumental temples of Eanna District are built Uruk III Jemdet Nasr period (3100–2900 BC); The 9 km city wall is built Uruk II Uruk IAnu District

The great Anu district is older than the Eanna district; however, few remains of writing have been found here. Unlike the Eanna district, the Anu district consists of a single massive terrace, the Anu Ziggurat, dedicated to the Sumerian sky god Anu. Sometime in the Uruk III period the massive White Temple was built atop of the ziggurat. Under the northwest edge of the ziggurat an Uruk VI period structure, the Stone Temple, has been discovered.

The Stone Temple was built of limestone and bitumen on a podium of rammed earth and plastered with lime mortar. The podium itself was built over a woven reed mat called ĝipar, which was ritually used as a nuptial bed. The ĝipar was a source of generative power which then radiated upward into the structure.[6] The structure of the Stone Temple further develops some mythological concepts from Enuma Elish, perhaps involving libation rites as indicated from the channels, tanks, and vessels found there. The structure was ritually destroyed, covered with alternating layers of clay and stone, then excavated and filled with mortar sometime later.

The Anu Ziggurat began with a massive mound topped by a cella during the Uruk period (ca. 4000 BC), and was expanded through 14 phases of construction. These phases have been labeled L to A3 (L is sometimes called X).[7] The earliest phase used architectural features similar to PPNA cultures in Anatolia: a single chamber cella with a terrazzo floor beneath which bucrania were found. In phase E, corresponding to the Uruk III period (ca. 3000 BC), the White Temple was built. The White Temple could be seen from a great distance across the plain of Sumer, as it was elevated 21 m and covered in gypsum plaster which reflected sunlight like a mirror. For this reason it is believed the White Temple is a symbol of Uruk's political power at the time.[citation needed] In addition to this temple the Anu Ziggurat had a monumental limestone-paved staircase, which was used in religious processions. A trough running parallel to the staircase was used to drain the ziggurat.

Eanna District

The Eanna district is historically significant as both writing and monumental public architecture emerged here during Uruk periods VI-IV. The combination of these two developments places Eanna as arguably the first true city and civilization in human history. Eanna during period IVa contains the earliest examples of cuneiform writing and possibly the earliest writing in history. Although some of these cuneiform tablets have been deciphered, difficulty with site excavations has obscured the purpose and sometimes even the structure of many buildings.

The first building of Eanna, Stone-Cone Temple (Mosaic Temple), was built in period VI over a preexisting Ubaid temple and is enclosed by a limestone wall with an elaborate system of buttresses. The Stone-Cone Temple, named for the mosaic of colored stone cones driven into the adobe brick façade, may be the earliest water cult in Mesopotamia. It was ritually demolished in Uruk IVb period and its contents interred in the Riemchen Building.

In the following period, Uruk V, about 100 m east of the Stone-Cone Temple the Limestone Temple was built on a 2 m high rammed-earth podium over a pre-existing Ubaid temple, which like the Stone-Cone Temple represents a continuation of Ubaid culture. However, the Limestone Temple was unprecedented for its size and use of stone, a clear departure from traditional Ubaid architecture. The stone was quarried from an outcrop at Umayyad about 60 km east of Uruk. It is unclear if the entire temple or just the foundation was built of this limestone. The Limestone temple is probably the first Inanna temple, but it is impossible to know with certainty. Like the Stone-Cone temple the Limestone temple was also covered in cone mosaics. Both of these temples were rectangles with their corners aligned to the cardinal directions, a central hall flanked along the long axis flanked by two smaller halls, and buttressed façades; the prototype of all future Mesopotamian temple architectural typology.

Between these two monumental structures a complex of buildings (called A-C, E-K, Riemchen, Cone-Mosaic), courts, and walls was built during Eanna IVb. These buildings were built during a time of great expansion in Uruk as the city grew to 250 hectares and established long-distance trade, and are a continuation of architecture from the previous period. The Riemchen Building, named for the 16×16 cm brick shape called Riemchen by the Germans, is a memorial with a ritual fire kept burning in the center for the Stone-Cone Temple after it was destroyed. For this reason, Uruk IV period represents a reorientation of belief and culture. The facade of this memorial may have been covered in geometric and figural murals. The Riemchen bricks first used in this temple were used to construct all buildings of Uruk IV period Eanna. The use of colored cones as a façade treatment was greatly developed as well, perhaps used to greatest effect in the Cone-Mosaic Temple. Composed of three parts: Temple N, the Round Pillar Hall, and the Cone-Mosaic Courtyard, this temple was the most monumental structure of Eanna at the time. They were all ritually destroyed and the entire Eanna district was rebuilt in period IVa at an even grander scale.

During Eanna IVa, the Limestone Temple was demolished and the Red Temple built on its foundations. The accumulated debris of the Uruk IVb buildings were formed into a terrace, the L-Shaped Terrace, on which Buildings C, D, M, Great Hall, and Pillar Hall were built. Building E was initially thought to be a palace, but later proven to be a communal building. Also in period IV, the Great Court, a sunken courtyard surrounded by two tiers of benches covered in cone mosaic, was built. A small aqueduct drains into the Great Courtyard, which may have irrigated a garden at one time. The impressive buildings of this period were built as Uruk reached its zenith and expanded to 600 hectares. All the buildings of Eanna IVa were destroyed sometime in Uruk III, for unclear reasons.[citation needed]

The architecture of Eanna in period III was very different from what had preceded it. The complex of monumental temples was replaced with baths around the Great Courtyard and the labyrinthine Rammed-Earth Building. This period corresponds to Early Dynastic Sumer c. 2900 BC, a time of great social upheaval when the dominance of Uruk was eclipsed by competing city-states. The fortress-like architecture of this time is a reflection of that turmoil. The temple of Inanna continued functioning during this time in a new form and under a new name, 'The House of Inanna in Uruk' (Sumerian: e2-dinanna unuki-ga). The location of this structure is currently unknown.[2]

Uruk into Late Antiquity

Although it had been a thriving city in Early Dynastic Sumer, especially Early Dynastic II, Uruk was ultimately annexed by the Akkadian Empire and went into decline. Later, in the Neo-Sumerian period, Uruk enjoyed revival as a major economic and cultural center under the sovereignty of Ur. The Eanna District was restored as part of an ambitious building program, which included a new temple for Inanna. This temple included a ziggurat, the 'House of the Universe' (Cuneiform: E2.SAR.A) to the northeast of the Uruk period Eanna ruins.

The ziggurat is also cited as Ur-Nammu Ziggurat for its builder Ur-Nammu. Following the collapse of Ur (c. 2000 BC), Uruk went into a steep decline until about 850 BC when the Neo-Assyrian Empire annexed it as a provincial capital. Under the Neo-Assyrians and Neo-Babylonians, Uruk regained much of its former glory. By 250 BC, a new temple complex the 'Head Temple' (Akkadian: Bīt Reš) was added to northeast of the Uruk period Anu district. The Bīt Reš along with the Esagila was one of the two main centers of Neo-Babylonian astronomy. All of the temples and canals were restored again under Nabopolassar. During this era, Uruk was divided into five main districts: the Adad Temple, Royal Orchard, Ištar Gate, Lugalirra Temple, and Šamaš Gate districts.[9]

Uruk, known as Orcha (Ὄρχα) to the Greeks, continued to thrive under the Seleucid Empire. During this period, Uruk was a city of 300 hectares and perhaps 40,000 inhabitants.[9][10][11] In 200 BC, the 'Great Sanctuary' (Cuneiform: E2.IRI12.GAL, Sumerian: eš-gal) of Ishtar was added between the Anu and Eanna districts. The ziggurat of the temple of Anu, which was rebuilt in this period, was the largest ever built in Mesopotamia.[11] When the Seleucids lost Mesopotamia to the Parthians in 141 BC, Uruk again entered a period of decline from which it never recovered. The decline of Uruk may have been in part caused by a shift in the Euphrates River. By 300 AD, Uruk was mostly abandoned, but a group of Mandaeans settled there,[12] and by c. 700 AD it was completely abandoned.