lower part of the valley and was succeeded by a son named Nancen-pinco who really laid the foundations of the Kingdom by conquering the head of the valley of Chimor and the neighboring valleys of Sana, Pacasmayo, Chicama, Viru, Chao and Santa." The estimated founding date of the last Chimú kingdom is in the first half of the fourteenth century. Nacen-pinco was believed to have ruled around 1370 and was followed by seven rulers whose names are not yet known. Minchancaman followed these rulers, and was ruling around the time of the Inca conquest (between 1462 and 1470). This great expansion is believed to have occurred during the late period of Chimú civilization, called: Late Chimú, but the development of the Chimú territory spanned a number of phases and more than a single generation. Nacen-pinco, "may have pushed the imperial frontiers to Jequetepeque and to Santa, but conquest of the entire region was an agglutinative process initiated by earlier rulers." (17) The Chimú expanded to include a vast area and many different ethnic groups. The first valleys seem to have joined forces willingly, but the Sican culture was assimilated through conquest. At its peak, the Chimú advanced to the limits of the desert coast to the valley of the Jequetepeque River in the north. Pampa Grande in the Lambayeque Valley was also ruled by the Chimú. To the south, they expanded as far as Carabayllo. Their expansion southward was stopped by the military power of the great valley of Lima. Historians and archeologists contest how far south they managed to expand. Life in the Chimú Empire From what scholars can tell the Chimú had a complex and consolidated empire. The capitol consisted of Chan Chan, lower-class, workshops and homes with a population estimate of around 30,000. These workshop were all built in around adobe palaces in order to impose social hierarchy ideals. The Chan Chan also had restrictions and were not offered the same privileges as the elite. They had limited access to rituals, bureaucracy, and administrative roles. The high regulations were necessary to keep order with food production and state re-distribution of the products. The class system also helped to determine who would work to create state-sponsored monuments. Rule The Chimú society was a four-level hierarchical system, with a powerful elite rule over administrative centers. The hierarchy was centered at the walled cities, called ciudadelas, at Chan Chan. The