and encouraged residents to become increasingly specialised. This theory thus leads the problem of the origin of cities back to the problem of origin of the state and of inequality. In the Late Uruk period, the urban site of Uruk far exceeded all others. Its surface area, the scale of its monuments and the importance of the administrative tools unearthed there indicate that it was a key centre of power. It is often therefore referred to as the 'first city', but it was the outcome of a process that began many centuries earlier and is largely attested outside Lower Mesopotamia (aside from the monumental aspect of Eridu). The emergence of important proto-urban centres began at the beginning of the 4th millennium BC in southwest Iran (Chogha Mish, Susa), and especially in the Jazirah (Tell Brak, Hamoukar, Tell al-Hawa, Grai Resh). Excavations in the latter region tend to contradict the idea that urbanisation began in Mesopotamia and then spread to neighbouring regions; the appearance of an urban centre at Tell Brak appears to have resulted from a local process with the progressive aggregation of village communities that had previously lived separately, and without the influence of any strong central power (unlike what seems to have been the case at Uruk). Early urbanisation should therefore be thought of as a phenomenon which took place simultaneously in several regions of the Near East in the 4th millennium BC, though further research and excavation is still required in order to make this process clearer to us. Examples of urbanism in this period are still rare, and in Lower Mesopotamia, the only residential area which has been excavated is at Abu Salabikh, a settlement of limited size. It is necessary to turn to Syria and the neighbouring sites of Habuba Kabira and Jebel Aruda for an example of urbanism that is relatively well-known. Habuba Kabira consisted of 22 hectares, surrounded by a wall and organised around some important buildings, major streets and narrow alleys, and a group of residences of similar shape organised around a courtyard. It was clearly a planned city created ex nihilo and not an agglomeration that developed passively from village to city. The planners of this period were thus capable of creating a complete urban plan and thus had an idea of what a city was, including its internal organisation and principal monuments. Urbanisation is not found everywhere in the sphere