Sumerian civilization had deep roots. The people had long shared a way of life not very different from that of their neighbours. They lived in villages and had a few important cult centres which were continuously occupied. One of these, at a place called Eridu, probably originated in about 5000 BC. It grew steadily well into historic times and by the middle of the fourth millennium there was a temple there which some have thought to have provided the original model for Mesopotamian monumental architecture, though nothing is now left of it but the platform on which it rested. Such cult centres began by serving those who lived near them. They were not true cities, but places of devotion and pilgrimage. They may have had no considerable resident populations, but they were usually the centres around which cities later crystallized and this helps to explain the close relationship religion and government always had in ancient Mesopotamia. Well before 3000 BC some such sites had very big temples indeed; at Uruk (which is called Erech in the Bible) there was an especially splendid one, with elaborate decoration and impressive pillars of mud brick, 8 feet in diameter.
Pottery is among the most important evidence linking pre-civilized Mesopotamia with historic times. It provides one of the first clues that something culturally important is going forward which is qualitatively different from the evolutions of the Neolithic. The so-called Uruk pots (the name is derived from the site where they were found) are often duller, less exciting than earlier ones. They are, in fact, mass-produced, made in standard form on a wheel (which first appears in this role). The strong implication of this is that when they came to be produced, there already existed a population of specialized craftsmen; it must have been maintained by an agriculture sufficiently rich to produce a surplus exchanged for their creations. It is with this change that the story of Sumerian civilization can conveniently be begun.
It lasts about 1,300 years (roughly from 3300 to 2000 BC), which is about as much time as separates us from the age of Charlemagne. At the beginning comes the invention of writing, possibly the only invention of comparable importance to the invention of agriculture before the age of steam. Most of it was done on clay for nearly half the time mankind has possessed the skill. Writing had in fact been preceded by the invention of cylinder seals, on which little pictures were incised to be rolled on to clay; pottery may have degenerated, but these seals were one of the great Mesopotamian artistic achievements. The earliest writings followed in the form of pictograms or simplified pictures (a step towards non-representative communication) on clay tablets, usually baked after they had been inscribed with a reed stalk. The earliest are in Sumerian and it can be seen that they are memoranda, lists of goods, receipts; their emphasis is economic and they cannot be read as continuous prose. The writing on these early notebooks and ledgers evolved slowly towards cuneiform, a way of arranging impressions stamped on clay by the wedge-like section of a chopped-off reed. With this the break with the pictogram form is complete. Signs and groups of signs come at this stage to stand for phonetic and possibly syllabic elements and are all made up of combinations of the same basic wedge shape. It was more flexible as a form of communication by signs than anything used hitherto, and Sumer reached it soon after 3000 BC.
A fair amount is therefore known about the Sumerian language. A few of its words have survived to this day; one of them is the original form of the word ‘alcohol’ (and the first recipe for beer), which is suggestive. But the language’s greatest interest is its appearance in written forms at all. Literacy must have been both unsettling and stabilizing. On the one hand it offered huge new possibilities of communicating; on the other, it stabilized practice because the consultation of a record as well as oral tradition became possible. It made much easier the complex operations of irrigating lands, harvesting and storing crops, which were fundamental to a growing society. Writing made for more efficient exploitation of resources. It also immensely strengthened government and emphasized its links with the priestly castes which monopolized literacy at first. Interestingly, one of the earliest uses of seals appears to be connected with this, since they were used somehow to certify the size of crops at their receipt in the temple. Perhaps they record at first the operations of an economy of centralized redistribution, where men brought their due produce to the temple and received there the food or materials they themselves needed.