of symbolism of feathered snakes in Mesoamerica from the formative period and on, for example in comparison to the Mayan Vision Serpent shown below.
The first culture to use the symbol of a feathered serpent as an important religious and political symbol was Teotihuacan. At temples such as the aptly named "Quetzalcoatl temple" in the Ciudadela complex, feathered serpents figure prominently and alternate with a different kind of serpent head. The earliest depictions of the feathered serpent deity were fully zoomorphic, depicting the serpent as an actual snake, but already among the Classic Maya the deity began acquiring human features.
In the iconography of the classic period Maya serpent imagery is also prevalent: a snake is often seen as the embodiment of the sky it self, and a vision serpent is a shamanic helper presenting Maya kings with visions of the underworld.
The archaeological record shows that after the fall of Teotihuacan that marked the beginning of the epi-classic period in Mesoamerican chronology around 600 AD, the cult of the feathered serpent spread to the new religious and political centers in central Mexico, centers such as Xochicalco, Cacaxtla and Cholula. Feathered serpent iconography is prominent at all of these sites. Cholula is known to have remained the most important center of worship to Quetzalcoatl, the Aztec/Nahua version of the feathered serpent deity, in the postclassic period.
During the epi-classic period a dramatic spread of feathered serpent iconography is evidence throughout Mesoamerica, and during this period begins to figure prominently at cites such as Chichen Itza, El Tajin, and throughout the Maya area. Colonial documentary sources from the Maya area frequently speak of the arrival foreigners from the central Mexican plateau often lead by a man whose name translates as "Feathered Serpent", it has been suggested that these stories recall the spread of the feathered serpent cult in the epiclassic and early postclassic periods.
In the postclassic Nahua civilization of central Mexico (Aztec) the worship of Quetzalcoatl was ubiquitous. The most important center was Cholula where the world's largest pyramid was dedicated to his worship. In Aztec culture depictions of Quetzalcoatl were fully anthropomorphic. Quetzalcoatl was associated with the winded god Ehecatl and is often depicted with his insignia: a beak like mask.
Based on the Teotihuacan iconographical depictions of the feathered serpent, archaeologist Karl Taube has argued that the feathered serpent was a symbol of fertility and internal political structures contrasting with the War Serpent symbolizing the outwards military expansion of the Teotihuacan empire.
Historian Enrique Florescano also analysing Teotihuacan iconography shows that the Feathered Serpent was part of a triad of agricultural deities: the Goddess of the Cave symbolizing motherhood, reproduction and life, Tlaloc, god of rain, lightning and thunder and the feathered serpent, god of vegetational renewal. The feathered serpent was furthermore connected to the star venus because of this star's importance as a sign of the beginning of the rainy season. To both Teotihuacan and Mayan cultures Venus was in turn also symbolically connected with warfare.
While not usually feathered, classic Maya serpent iconography seems related to the belief in a sky, venus, creator, war and fertility related serpent deity. In the example from Yaxchilan the Vision Serpent has the human face of the young maize god, further suggesting a connection to fertility and vegetational renewal, the Mayan Young Maize god was also connected to Venus.
In Xochicalco depictions of the feathered Serpent is accompanied by the image of a seated, armed ruler and the hieroglyph for the day sign 9 Wind. The date 9 wind is known to be associated with fertility, venus and war among the Maya and frequently occurs in relation to Quetzalcoatl in other Mesoamerican cultures.
Based on the iconography of the feathered serpent deity at sites such as Teotihuacan, Xochicalco, Chichen Itza, Tula and Tenochtitlan combined