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The layout of Chichen Itza site core developed during its earlier phase of occupation, between 750 and 900 AD.[19] Its final layout was developed after 900 AD, and the 10th century saw the rise of the city as a regional capital controlling the area from central Yucatán to the north coast, with its power extending down the east and west coasts of the peninsula.[20] The earliest hieroglyphic date discovered at Chichen Itza is equivalent to 832 AD, while the last known date was recorded in the Osario temple in 998.[21]
[edit]Establishment
The Late Classic city was centred upon the area to the southwest of the Xtoloc cenote, with the main architecture represented by the substructures now underlying the Las Monjas and Observatorio and the basal platform upon which they were built.[22]
[edit]Ascendancy
Chichen Itza rose to regional prominence towards the end of the Early Classic period (roughly 600 AD). It was, however, towards the end of the Late Classic and into the early part of the Terminal Classic that the site became a major regional capital, centralizing and dominating political, sociocultural, economic, and ideological life in the northern Maya lowlands. The ascension of Chichen Itza roughly correlates with the decline and fragmentation of the major centers of the southern Maya lowlands.
As Chichen Itza rose to prominence, the cities of Yaxuna (to the south) and Coba (to the east) were suffering decline. These two cities had been mutual allies, with Yaxuna dependent upon Coba. At some point in the 10th century Coba lost a significant portion of its territory, isolating Yaxuna, and Chichen Itza may have directly contributed to the collapse of both cities.[23]

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