A major ceremonial center of the Zapotec people in Oaxaca, Mexico, built around 900 BC on top of an artificially flattened mountain. Monte Albán (I = 900-300 BC) was probably created to serve as the capital of the entire valley, which had previously been divided among several states. It was an immense complex of monumental construction, with a huge plaza (300 x 200 m) dominated by three central mounds. The plaza was flanked on the east and west by temples, pyramids, and platform mounds; on the northern and southern extremities are more complexes of monumental building, including a ball court. There are also underground passageways. By the end of Period I, the city had between 10,000- 20,000 inhabitants living in houses on hill slope terraces around a nucleus of ceremonial and governmental buildings. Hieroglyphic writing was in use, with bar-and-dot numerals, and dates were expressed in terms of the calendar round. More than 300 carved slabs ('danzantes') depict naked and contorted figures who may be captives, and inscriptions definitely recording conquests occur soon afterwards. In Late I/Early II, the city was surrounded by a defense wall. Period I includes the appearance of Grey Ware and Olmec-influenced monumental art. Period II is characterized by contact with Maya lowland centers and later, by the increasing influence of Teotihuacán. Period IIIA (the 3rd-5th centuries AD) is marked by increased contact with Teotihuacán, reflected in pottery (thin orange ware, cylindrical tripod vases), tomb frescoes, Talud-Tablero architecture, and stela inscriptions. Monte Albán reached the height of its power in Period IIIB, 500-900 AD, during which elaborate funerary urns in Grey Ware make their appearance and when the site reached its peak population of 50-60,000 people. Most of the surviving buildings belong to this time. During Monte Albán IV, 900-1521 AD, building ceased. After 900, the centers of power moved elsewhere and Monte Albán was considerably depopulated. It was essentially abandoned. In Period V, Monte Albán was of only secondary importance as a city and a political force. Mixtec art styles make their appearance in the valley and Monte Albán was used as a cemetery, with earlier Zapotec tombs reused for the Mixtec dead. One of the richest discoveries in ancient Mexico was Tomb 7, with over 500 precious offerings in Mixtec style gold and silver ornaments, fine stonework, and a series of bones carved with hieroglyphic and calendrical inscriptions.