The founding of Tenochtitlan in 1325 was one of the most consequential events in the history of Mesoamerica. On a small island in the saline waters of Lake Texcoco, in a valley dominated by larger and more powerful cities, the Mexica founded the city that would become the capital of the largest and most powerful state in pre-Columbian North America. The founding legend, the image of an eagle perched on a cactus devouring a serpent, has become the central symbol of the modern Mexican nation, and the story of the Mexica arrival in the Valley of Mexico is one of the great foundation myths of the Americas. Yet the founding of Tenochtitlan was not a single event but a long process, marked by struggle, by accommodation with the existing political order, and by a remarkable transformation of the natural environment of the lake.
The Site and Its Setting
The Mexica chose to found their city on a small island in the western part of Lake Texcoco, in the central part of the Valley of Mexico. The site was not an obvious choice. The island was small, marshy, and surrounded by the salt-laden waters of the lake. The Mexica had no experience of urban life on such a site, and the surrounding waters were contested by larger and more powerful cities. Yet the site had several advantages. It was defensible, surrounded as it was by the lake, and it was well located for trade and communication with the other cities of the valley. The lake itself was rich in fish, waterfowl, and other resources, and the surrounding wetlands could be transformed into productive agricultural land through the development of chinampas.
The Valley of Mexico, in which Tenochtitlan was located, was a high-altitude basin, surrounded by mountains and dominated by a system of interconnected lakes. The valley had been the site of major urban civilizations for at least a thousand years before the Mexica arrival, and the lake margins were already home to a network of cities, towns, and villages. The largest of these cities, including Azcapotzalco, Texcoco, and Xochimilco, were politically and economically powerful, and the Mexica were initially forced to accept subordinate status in the existing political order.
The Founding Legend
According to Mexica tradition, the founding of Tenochtitlan occurred in 1325, when the wandering Mexica saw, on the island in Lake Texcoco, the long-promised sign from Huitzilopochtli: an eagle perched on a prickly pear cactus, devouring a serpent. The image, recorded in the Aztec codices and echoed in the modern Mexican flag, marked the moment when the Mexica believed they had fulfilled the divine command and become a chosen people. The Mexica divided the island into four quarters, each associated with one of the four Mexica lineages, and they began to build the city that would become the capital of the Mexica empire.
The founding legend is rich in symbolism. The cactus on which the eagle perches represents the island of Tenochtitlan, and the eagle itself represents the Mexica as the people of the sun. The serpent that the eagle devours represents the enemies of the Mexica, and the conquest of the serpent represents the Mexica destiny of imperial rule. The legend reflects the Mexica self-understanding as a chosen people, a group with a divine mission to dominate the Valley of Mexico and, ultimately, the wider world of Mesoamerica.
The Early City
The early years of Tenochtitlan were difficult. The Mexica were vassals of the Tepanecs of Azcapotzalco, and for most of the fourteenth century they paid tribute to the Tepanec king Tezozomoc. The city was small and poor, and the Mexica were forced to perform menial labor for their Tepanec overlords. Yet the Mexica were also building the foundations of a great city. They developed the chinampa system of agriculture, which allowed them to grow crops on the lake margins, and they developed a system of causeways and canals that connected the island to the mainland. They also developed a sophisticated system of religion, education, and government that would eventually allow them to challenge their Tepanec overlords.
The first Tlatoani of Tenochtitlan was Acamapichtli, who ruled from 1375 to 1395. Acamapichtli was a descendant of the Mexica ruling family, and he was chosen as Tlatoani through a process that combined elements of hereditary succession and election by the council. He was a skillful diplomat, and he managed to maintain the loyalty of the various Mexica factions while also building alliances with the other powers of the valley. He was succeeded by a series of rulers, including Huitzilihuitl and Chimalpopoca, who continued the work of consolidating the Mexica state.
The Transformation of the Lake
One of the most remarkable aspects of the early Tenochtitlan was the transformation of the natural environment of the lake. The Mexica developed an sophisticated system of agriculture, the famous chinampas of the Valley of Mexico, that allowed them to grow crops on the lake margins. By piling up mud and aquatic vegetation in the shallow margins, the Mexica created a checkerboard of long, narrow plots — typically some 30 meters by 2 to 4 meters — threaded by a network of canoe-navigable canals.
The chinampas were extraordinarily productive, and they allowed the Mexica to feed a growing population on a relatively limited area of land. The Mexica also built a network of causeways that connected the island to the mainland, and they built a great aqueduct that brought fresh water from the springs of Chapultepec. The aqueduct was a remarkable engineering projects of pre-Columbian America, and it required a sophisticated understanding of hydraulics and construction.
The Rise of Tenochtitlan
By the early fifteenth century, Tenochtitlan was the most populous city in the Valley of Mexico, and its markets, particularly the great Tlatelolco market nearby, were famous throughout Mesoamerica. The Mexica had developed a sophisticated economy based on agriculture, trade, and tribute, and they had built a powerful military that would soon be used to challenge the Tepanec Empire of Azcapotzalco. The transformation of Tenochtitlan from a small island settlement to a major city was one of the most notable achievements of the pre-Columbian Americas, and it set the stage for the founding of the Triple Alliance and the rise of the Mexica empire.
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See also:
- Why did the Aztecs build Tenochtitlan on a lake? — the strategic and practical reasons for the site
- What does the eagle on the cactus symbolize? — the symbolism of the founding legend
- How was Tenochtitlan built on Lake Texcoco? — the engineering of the city
- Origins and Migration of the Aztecs — the Mexica before the founding
- Chinampas and Aztec Agricultural Innovation — the agriculture that fed Tenochtitlan
- History of the Aztec Civilization — the broader historical context