 The island that the city was founded on was divided into four calpullis or neighborhoods that were divided by the main north-south roads leading to Tepeyac and Iztapalapa respectively and the west-east road that lead to Tacuba and to a dike into the lake, respectively.The calpullis were named Cuepopan, Atzacualco, Moyotla and Zoquipan, which had subdivisions and a "tecpan" or district council each.The intersection of these roads was the center of the city and of the Aztec world.