The history of the Aztec civilization is one of the most notable stories in the pre-Columbian Americas. In less than two centuries, a wandering people of uncertain origin transformed themselves into the rulers of the largest and most powerful empire in Mesoamerica, only to see that empire collapse in the wake of the Spanish arrival in 1519. The Mexica, as the Aztecs called themselves, left behind an enormous body of material evidence and written testimony, allowing modern historians to reconstruct their past with a precision that few other pre-modern civilizations can match. Their capital Tenochtitlan, built on a salt lake in the Valley of Mexico, was among the largest cities in the world in the early sixteenth century, larger than any contemporary European capital except Paris and perhaps Constantinople.
This article traces the full arc of Aztec history, beginning with the mythical origins of the Mexica in the legendary homeland of Aztlan and ending with the long aftermath of conquest, the suppression of indigenous religion, and the persistence of Nahua identity into the colonial era and beyond. It serves as the central hub for more detailed discussions of specific periods, places, and events, all of which are explored in depth in the linked articles throughout this encyclopedia.
A Note on Terminology
The people commonly called the Aztecs did not, in fact, call themselves by that name. “Aztec” derives from the Nahuatl word Aztēcah, meaning “people from Aztlan,” and was used loosely by early modern European scholars to refer to the dominant Nahua peoples of central Mexico. The Mexica were the most prominent branch of this larger ethnic family, and their political and cultural descendants ruled Tenochtitlan and its tributary empire at the moment of contact with Spain. In modern usage, “Aztec” is generally used to refer to the Mexica and the peoples they dominated or absorbed in the Valley of Mexico, particularly those who shared their language, religion, and political traditions.
The political unit they ruled is often called the Aztec Empire, though it is more accurately described as the Triple Alliance, a coalition of three Nahua city-states that dominated central Mexico between 1428 and 1521. The Mexica of Tenochtitlan were the senior partners, but the alliance with Texcoco and Tlacopan was central to its character and its success. Throughout this article, the terms “Aztec” and “Mexica” are used in the senses most familiar to English-speaking readers, while acknowledging the broader Nahua world from which they emerged.
The Legendary Origins of the Mexica
Almost nothing is known for certain about the prehistory of the Mexica before they entered the Valley of Mexico in the thirteenth century. What we have instead is a corpus of myth, recorded by Spanish and indigenous chroniclers in the sixteenth century, that describes the Mexica as a people driven by destiny from a place called Aztlan, an island homeland of unclear location, possibly in northwestern Mexico or even further north. The migration, known in Nahuatl as the tōltēcatlācatolliayotl or simply the long wandering, is described in several foundational texts, most famously the Codex Boturini and the Crónica Mexicáyotl of Hernando de Alvarado Tezozomoc.
According to these accounts, the Mexica left Aztlan under the guidance of Huitzilopochtli, a tribal deity who appeared to them in the form of a hummingbird and who promised them a destiny of greatness. They were told to settle only where they saw an eagle perched on a cactus, devouring a serpent, a sign that became the icon of the modern Mexican state. The journey was long, painful, and at times catastrophic. The Mexica were at various times enslaved by more powerful peoples, including the Toltecs of Tollan (whose collapse had left a power vacuum across central Mexico) and the Chichimec peoples of the north. At one point, the god Huitzilopochtli, whose name means “hummingbird of the south” or “hummingbird of the left,” ordered the Mexica to cut out the hearts of captured warriors, a foreshadowing of the human sacrifice that would become a central feature of their religion.
The migration is traditionally dated to the early twelfth century, though the chronology is uncertain. By the mid-thirteenth century, the Mexica had reached the Valley of Mexico, a high-altitude basin dominated by a series of large lakes. They were poor, peripheral, and politically weak, and for several decades they served as mercenaries and laborers for the established kingdoms of the valley, particularly the Tepanecs of Azcapotzalco. Even in this period, however, the Mexica were building a distinctive religious and political identity that would eventually allow them to challenge their patrons and to found a city that would become one of the wonders of the world.
The Founding of Tenochtitlan
According to Mexica tradition, the founding of Tenochtitlan occurred in 1325, when the wandering Mexica saw, on a small island in Lake Texcoco, the long-promised sign: 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 site they chose was not ideal for settlement. It was a marshy, partly submerged island in a lake known for its salt content, and the surrounding waters were contested by larger and more powerful cities. Yet the Mexica began to build, driving wooden piles into the lakebed and constructing the foundations of what would become one of the largest cities in the world.
The early years of Tenochtitlan were difficult. The Mexica were vassals of Azcapotzalco, and for most of the fourteenth century they paid tribute to the Tepanec king Tezozomoc. They were also, like their neighbors, subject to occasional flooding, drought, and famine. Yet the city grew, partly through the Mexica’s remarkable agricultural innovation on chinampas, the so-called floating gardens that allowed them to feed a growing population, and partly through the trading of goods from across the lake and beyond. 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 reign of Itzcoatl, who ruled from 1427 to 1440, marked the beginning of the Mexica imperial project. Itzcoatl, whose name means “obsidian serpent,” was the first of a new dynastic line that would dominate the Mexica state for the next century. He led the coalition of Tenochtitlan, Texcoco, and Tlacopan that overthrew the Tepanec Empire of Azcapotzalco in 1428, an event traditionally called the foundation of the Triple Alliance. He also oversaw the destruction of the older Mexica records and the rewriting of Mexica history so that emphasized the legitimacy of his dynasty, an episode recorded in the Codex Mendoza and discussed in detail in the work of Domingo Francisco de San Antón Muñón Chimalpahin Quauhtlehuanitzin, an indigenous chronicler of the late sixteenth and early seventeenth centuries.
The Rise of the Triple Alliance
The Triple Alliance that emerged from the defeat of Azcapotzalco was an unusual political entity. It was a coalition of three city-states, each of which retained its own internal government and its own ruling dynasty, but which agreed to share the costs and benefits of imperial expansion. Tenochtitlan, as the most populous and the seat of the war god Huitzilopochtli, was the senior partner, providing the largest share of warriors and receiving the largest share of tribute. Texcoco, whose king Nezahualcoyotl was one of the best-documented rulers in Mesoamerican history, contributed administrative and intellectual leadership. Tlacopan, the smallest of the three, played a more modest role, but its participation in the alliance gave the coalition geographic reach into the western Valley of Mexico.
The early decades of the Triple Alliance were characterized by rapid expansion. The first target was the remnant of the Tepanec Empire, whose territories were absorbed and reorganized. The next targets were the city-states of the southern Valley of Mexico and the Huastec region to the north. By the reign of Moctezuma I, who ruled from 1440 to 1469, the Triple Alliance controlled most of central Mexico. Moctezuma I, the second of the new imperial line, was a brilliant administrator who consolidated the institutions of the new state, expanded the Templo Mayor in the sacred precinct of Tenochtitlan, and built the dyke that separated the salty waters of Lake Texcoco from the freshwater lake to the west, an engineering project of remarkable scale that allowed the expansion of chinampa agriculture around the capital.
The later fifteenth and early sixteenth centuries saw the empire expand south and east, into the rich regions of Oaxaca and the Gulf Coast, and west, into the territory of the Tarascan Empire, the only major Mesoamerican state to resist Mexica conquest successfully. The reign of Ahuitzotl, who ruled from 1486 to 1502, marked the greatest territorial extent of the empire. Ahuitzotl, whose name means “water-serpent,” was a relentless warrior who carried out the dedication of the reconstructed Templo Mayor in 1487, an event recorded in many sources and described in detail in the Florentine Codex compiled by Bernardino de Sahagún and his indigenous collaborators. He also suffered one of the great disasters of Mexica history, a flood in 1499 that devastated Tenochtitlan and forced a major reconstruction of the city’s infrastructure.
The Reign of Moctezuma II
The last independent ruler of the Mexica was Moctezuma II, known in many sources as Montezuma, who came to power in 1502. Moctezuma was a serious, even melancholy figure, a priest-ruler who took the imperial office with reluctance and who presided over an empire at the height of its power and its anxieties. He is remembered both for his dignified conduct and for the disasters that followed his reign, particularly the Spanish conquest that began in 1519. In the pre-conquest years, Moctezuma presided over a final wave of imperial expansion, including the conquest of Tututepec in 1503, and he reorganized the tribute system to extract more wealth from the provinces. He also, according to many sources, was increasingly troubled by a series of ominous portents, including the appearance of a comet, a column of fire, and other strange phenomena, all of which seemed to predict the fall of the empire.
The arrival of the Spanish in 1519 caught the Mexica state at a moment of great internal tension. The empire was, in some respects, fragile. Its subject peoples were held together by force as much as by consent, and there were numerous revolts and acts of defiance. The ideology of imperial rule, with its insistence on the centrality of Mexica religion and the obligation of subject peoples to pay tribute, was powerful but also resented. When Hernán Cortés and his small band of Spaniards, accompanied by thousands of indigenous allies from the Tlaxcalans, the Totonacs, and others, made their way to Tenochtitlan, they found a vast and complex state that, even at the height of its power, was vulnerable to the right combination of force, diplomacy, and disease.
The Spanish Conquest and the Fall of Tenochtitlan
The Spanish conquest of the Aztec Empire is one of the most thoroughly documented and most fiercely debated events in world history. The traditional Spanish narrative, recorded by Cortés himself in his letters to Charles V and by his chaplain Francisco López de Gómara, portrays the conquest as a series of military and religious triumphs, in which a small band of Christian heroes overcame a vast pagan empire. The traditional indigenous narrative, recorded in the works of writers such as Fernando de Alva Ixtlilxochitl, Domingo Francisco de San Antón Muñón Chimalpahin, and the anonymous authors of various codices, offers a more complex and often darker view, in which the arrival of the Spanish is a story of betrayal, plague, and tragedy. Modern scholarship has done much to integrate these perspectives, and the consensus today is that the conquest was a multi-causal event in which military, biological, political, and cultural factors all played a role.
Cortés landed on the coast of Mexico near modern Veracruz in April 1519. He moved inland, formed alliances with peoples hostile to the Mexica, most notably the Tlaxcalans, and made his way to Tenochtitlan, arriving in November 1519. Moctezuma received him with elaborate ceremony, and the Spanish were housed in the palace of Axayacatl, the father of Moctezuma. The subsequent months were marked by a series of misunderstandings, provocations, and outbreaks of violence. The Spanish took Moctezuma hostage, an act that disrupted Mexica government and provoked resistance. Pedro de Alvarado’s massacre of Mexica nobles during the festival of Toxcatl in May 1520, an event discussed in detail in indigenous sources and in the work of Diego Durán, led to open warfare.
The Spanish were driven from Tenochtitlan on the night of June 30, 1520, an event known as La Noche Triste in the Spanish tradition. Spanish accounts long emphasized the gold and silver lost to the lake during the flight, though modern historians note that the treasure had probably been much smaller than the chroniclers claimed. Cortés regrouped, built a small fleet of brigantines to challenge Mexica control of the lake, and returned to the siege of Tenochtitlan in May 1521. The siege lasted for several months and was marked by house-to-house fighting, starvation, and a devastating smallpox epidemic that killed much of the Mexica leadership, including the emperor Cuitláhuac, who had replaced Moctezuma after his death in 1520. The last Mexica emperor, Cuauhtémoc, surrendered to the Spanish on August 13, 1521, marking the formal end of the Aztec Empire.
The Aftermath of Conquest
The fall of Tenochtitlan did not end the history of the Mexica, nor of the peoples they had ruled. The Spanish conquest was followed by three centuries of colonial rule, in which the surviving indigenous population was gradually reduced in number, converted to Christianity, and incorporated into the Spanish imperial system. The immediate consequences of conquest were catastrophic. Smallpox, which had arrived with the Spanish, devastated the indigenous population, and the wars and famines of the conquest era compounded the disaster. Within a century of first contact, the indigenous population of central Mexico had fallen by perhaps 80 or 90 percent, one of the most rapid demographic collapses in human history.
Yet the survivors of the conquest did not passively accept Spanish rule. Throughout the colonial period, there were indigenous revolts, including the great Mixton War of 1540-1542, led by the Zacatecas chief Tzintzicha Tangaxoán II, and numerous smaller uprisings. There was also a remarkable indigenous intellectual tradition, in which writers in Nahuatl and in Spanish preserved the memory of the pre-conquest past and adapted Christianity to indigenous sensibilities. Writers such as the previously mentioned Chimalpahin and Alva Ixtlilxochitl, as well as figures like Hernando de Alvarado Tezozomoc, Fernando de Alva Ixtlilxochitl, and the anonymous chronicler of Tlatelolco, kept alive an indigenous perspective on the conquest and its aftermath. The Franciscan Bernardino de Sahagún, working with indigenous collaborators, compiled the great Florentine Codex, a twelve-book encyclopedia of Mexica culture that remains one of the most important sources on Aztec civilization.
The colonial period saw the gradual transformation of Mexica society. The great temples of Tenochtitlan were destroyed, and the Cathedral of Mexico City was built on their ruins. The Aztec ruling families were incorporated into the new Spanish elite through marriage and through grants of titles and lands. The indigenous commoners were reduced to a labor force for Spanish agriculture and industry, and their religious and cultural practices were systematically suppressed, although many survived in disguised form in the folk Catholicism of modern Mexico.
Mexico City and the Persistence of Mexica Identity
The site of Tenochtitlan was rebuilt as the capital of the Viceroyalty of New Spain, the Spanish colonial administrative unit that governed most of North America. Mexico City, as it came to be called, was for three centuries one of the largest and most important cities in the Spanish Empire, and it served as the capital of independent Mexico after 1821. The destruction of Tenochtitlan was not total. The Templo Mayor was uncovered by chance in 1978 when electrical workers digging in central Mexico City discovered a great stone disk, the Coyolxauhqui Stone, depicting the dismembered body of the moon goddess. Subsequent excavations revealed the remains of the great temple and the rich religious life of the Mexica capital. Today, the Templo Mayor museum, located next to the ruins, houses one of the most important collections of Aztec art in the world, and the surrounding neighborhood, the Zócalo, remains the political and symbolic heart of the Mexican state.
The persistence of Mexica identity into the modern era is a remarkable features of post-conquest history. The Mexica themselves did not survive as a distinct ethnic group, but their descendants, the modern Nahua peoples of central Mexico, retained their language, many of their customs, and a deep sense of historical identity. The Mexican national identity that emerged in the nineteenth and twentieth centuries drew heavily on Aztec symbolism, particularly through the figure of the mestizo, a person of mixed Spanish and indigenous ancestry, and through the use of Aztec icons in national mythology. The modern Mexican flag, with its eagle-on-cactus motif, is a direct descendant of the Mexica founding legend, and the pre-conquest past is widely invoked in Mexican political and cultural life.
Historical Sources and the Modern Study of the Aztecs
The modern study of Aztec history depends on a remarkable corpus of sources, ranging from pre-conquest codices to Spanish colonial chronicles, from archaeological excavations at Tenochtitlan and other sites to modern linguistic and ethnohistorical research. The most important indigenous sources include the Codex Mendoza, a tribute and history codex prepared for the first Viceroy of New Spain; the Codex Boturini or Tira de la Peregrinación, a pictorial account of the Mexica migration; and the Florentine Codex, the great encyclopedic work compiled under Sahagún. The most important Spanish sources include the letters of Cortés, the chronicles of Bernal Díaz del Castillo, López de Gómara, and others, and the histories of Dominican and Franciscan friars.
Modern scholarship on the Aztecs has been transformed by archaeological research, particularly the great excavations at Tenochtitlan carried out in the twentieth and twenty-first centuries, and by the application of new methods such as isotopic analysis, remote sensing, and DNA study. The Templo Mayor Project, led by archaeologist Eduardo Matos Moctezuma, has been particularly important in revealing the extent and richness of Mexica religious life. Ethnohistorians such as James Lockhart, Susan Toby Evans, and Frances Berdan have done much to integrate the indigenous and Spanish sources and to reconstruct the inner workings of Mexica society from the perspective of its members.
A Period of Reckoning
The history of the Aztec civilization is, in the end, a history of remarkable achievement and catastrophic loss. The Mexica built a city of perhaps 200,000 inhabitants on a salt marsh, fed it with an agricultural technology that has only recently been equaled in productivity, and ruled an empire of perhaps ten million people through a sophisticated system of tribute and political alliance. Their art, architecture, writing, and calendar are among the most sophisticated achievements of any pre-modern civilization. Yet they were also a deeply violent people, whose practice of human sacrifice on a scale perhaps extraordinary in world history is one of the great moral challenges of Mesoamerican history. The encounter with the Spanish ended their independence and set in motion a process of demographic collapse, cultural transformation, and political subordination that would shape the history of the Americas for centuries to come.
The articles linked throughout this overview, and gathered in the seven major sections of this encyclopedia, cover every aspect of Aztec history, from the founding of Tenochtitlan to the Spanish conquest, from the Tlatoani and the Cihuacoatl to the Eagle Warriors and the pochteca merchants.
Related Articles
See also:
- Origins and Migration of the Aztecs — the legendary and historical origins of the Mexica
- Founding of Tenochtitlan — the rise of the Mexica capital
- The Triple Alliance and Imperial Expansion — the political coalition that dominated central Mexico
- Spanish Conquest and Fall of the Aztec Empire — the events of 1519-1521
- Historical Codices and Sources on the Aztecs — the documentary record of Mexica civilization
- Major Gods of the Aztec Pantheon — the religious framework of Mexica life
- Aztec Society and Daily Life — how ordinary Mexica lived
- Aztec Empire and Political Structure — institutions of the imperial state