provides the earliest signs of the existence of states in the Near East. The monumental architecture is more imposing than that of the preceding period; 'Temple D' of Eanna covers around 4600 m2—a substantial increase compared to the largest known temple of the Ubayd period, level VI of Eridu, which had an area of only 280 m2—and the Eanna complex's other buildings cover a further 1000 m2, while the Ubayd temple of Eridu was a stand-alone structure. The change in size reflects a step-change in the ability of central authorities to mobilise human and material resources. Tombs also show a growing differentiation of wealth and thus an increasingly powerful elite, who sought to distinguish themselves from the rest of the population by obtaining prestige goods, through trade if possible and by employing increasingly specialised artisans. The idea that the Uruk period saw the appearance of a true state, simultaneously with the appearance of the first cities (following Gordon Childe), is generally accepted in scholarship but has been criticised by some scholars, notably J.D. Forest who prefers to see the Empire of Akkad in the 24th century BC as the first true state and considers Late Uruk to have known only "city-states" (which are not complete states in his view). Regardless, the institution of state-like political structures is concomitant with several other phenomena of the Uruk period. What kind of political organisation existed in the Uruk period is debated. No evidence supports the idea that this period saw the development of a kind of 'proto-empire' centred on Uruk, as has been proposed by Algaze and others. It is probably best to understand an organisation in 'city-states' like those that existed in the 3rd millennium BC. This seems to be corroborated by the existence of 'civic seals' in the Jemdet Nasr period, which bear symbols of the Sumerian cities of Uruk, Ur, Larsa, etc. The fact that these symbols appeared together might indicate a kind of league or confederation uniting the cities of southern Mesopotamia, perhaps for religious purposes, perhaps under the authority of one of them (Uruk?). It is clear that there were major changes in the political organisation of society in this period. The nature of the powerholders is not easy to determine because they cannot be identified in the written sources and the archaeological evidence is not very informative: no palaces or other buildings for the exercise of power