To truly begin to understand the people known to history as the Aztecs, one must first understand their cosmos. Theirs was not a world of gentle gods and idyllic landscapes. It was a universe balanced on a knife’s edge, a precarious existence earned through blood and relentless vigilance. They were, in their own estimation, the People of the Sun, a title that was not a boast but a profound and terrifying responsibility. Their entire civilization was built around a sacred mission: to keep the sun alive and, in doing so, to stave off the end of the world. This was not merely a belief, but the central, animating principle of their society, the justification for their wars, the rhythm of their rituals, and the source of their formidable power.
Before delving further, a clarification of names is in order. The people who built the great city of Tenochtitlan and forged a mighty empire did not call themselves Aztecs. They referred to themselves as the Mexica, and in more formal contexts, the Culhua-Mexica, to associate themselves with the prestigious Toltec lineage of Colhuacán. The term "Aztec" derives from Aztlan, their mythical northern homeland, and means "people from Aztlan." It was a name that encompassed not just the Mexica but other related Nahuatl-speaking groups. While the term Aztec gained popularity in the 19th century and remains the common identifier, for the people at the heart of our story, their identity was Mexica.
The Mexica worldview was shaped by a dramatic and cyclical creation story known as the Legend of the Five Suns. They believed the universe had already been created and destroyed four times. Each previous era, or "Sun," had been ruled by a different god and populated by a different race of beings, only to meet a cataclysmic end. The First Sun, Nahui Ocelotl (Four Jaguar), was ruled by the god Tezcatlipoca. This age was populated by giants who were eventually devoured by jaguars. The Second Sun, Nahui Ehecatl (Four Wind), was ruled by Quetzalcoatl. The world was destroyed by immense hurricanes, and its inhabitants were turned into monkeys.
The Third Sun, Nahui Quiahuitl (Four Rain), was under the dominion of the rain god Tlaloc. A fiery rain consumed the world, and its people were transformed into turkeys. The Fourth Sun, Nahui Atl (Four Water), was governed by the water goddess Chalchiuhtlicue. A colossal flood annihilated this world, turning its people into fish. After the destruction of the Fourth Sun, the gods gathered in the darkness at the sacred site of Teotihuacan to decide who would become the new sun. Two gods volunteered: the arrogant and wealthy Tecuciztecatl, and the humble, sickly Nanahuatzin. When the time came to leap into a great sacrificial pyre, Tecuciztecatl hesitated, but Nanahuatzin threw himself into the flames without fear. He emerged in the sky as the new sun, Tonatiuh. Shamed, Tecuciztecatl followed, becoming the moon.
Thus began the age of the Fifth Sun, Nahui Ollin (Four Movement). The Mexica believed they were living in this fifth and final age. However, the newly created sun refused to move across the sky. It demanded nourishment, the sacrifice of the other gods. Only after they had given their lives did the sun begin its daily journey. This cosmic sacrifice set a powerful precedent. The gods had given their lives to set the world in motion, and now it was humanity's turn to sustain it. The Fifth Sun, they believed, was fated to be destroyed by massive earthquakes. The Mexica saw themselves as the chosen people, tasked with the sacred duty of nourishing the sun with the most precious substance they knew: human blood. This was not an act of cruelty for its own sake, but a desperate and necessary obligation to postpone the inevitable apocalypse.
At the heart of this cosmic drama was the Mexica’s patron deity, Huitzilopochtli, whose name means “Hummingbird of the South” or “Hummingbird on the Left.” He was the god of war, the sun, and human sacrifice, and his story is as violent and dramatic as the worldview he embodied. He was not an ancient, primordial deity but the specific god of the Mexica tribe, who rose in prominence as they did. According to their legends, his birth was nothing short of miraculous and terrifying. His mother, the earth goddess Coatlicue (“Serpent Skirt”), was sweeping a temple on the sacred mountain of Coatepec when a ball of fine hummingbird feathers fell from the sky. She tucked it into her waistband and, without any other union, became pregnant.
This mysterious pregnancy enraged Coatlicue’s other children: her daughter, the moon goddess Coyolxauhqui, and her four hundred sons, the Centzonhuitznahua, who represented the stars. Considering the pregnancy a dishonor, they conspired to kill their mother. As they advanced on the mountain, a voice from Coatlicue’s womb reassured her. At the very moment of attack, Huitzilopochtli sprang from his mother’s womb, fully grown, armed, and ready for battle. He wielded the Xiuhcoatl, a mythical “fire serpent,” as his weapon. In a furious display of power, he slew his sister Coyolxauhqui, dismembered her, and tossed her body down the mountainside. He then pursued and slaughtered most of his four hundred brothers, scattering them across the sky.
This myth is a powerful cosmic allegory. Huitzilopochtli’s dramatic birth represents the daily sunrise. His battle against his siblings is the perpetual struggle of the sun (Huitzilopochtli) against the moon (Coyolxauhqui) and the stars (the Centzonhuitznahua). Every dawn, the sun god is reborn and violently drives away the darkness, ensuring the survival of the world for another day. This celestial conflict was the model for Mexica life. They were the warriors of the sun, and their purpose was to emulate their patron god. Just as Huitzilopochtli vanquished his siblings, the Mexica were destined to conquer their enemies.
The Mexica believed the sun god required daily nourishment to have the strength for this celestial battle. This sustenance was called tlaxcaltiliztli, and it came in the form of human hearts and blood. The Mexica referred to human blood as chalchihuatl, or “precious water,” the sacred liquid that contained the life force necessary to fuel the sun. This belief was the cornerstone of their state religion and the primary justification for the constant warfare that characterized their empire. War was not merely a tool for political or economic gain, although it certainly served those purposes. It was a sacred endeavor, a cosmic necessity. The primary goal of a Mexica warrior was not to kill their opponent on the battlefield, but to capture them alive. These captives would then be taken back to the great temples of Tenochtitlan and sacrificed, their hearts offered to Huitzilopochtli to ensure the sun would rise again.
This worldview was underpinned by a complex and sophisticated philosophical system. Central to their understanding of the universe was the concept of teotl. This Nahuatl term is often translated as “god,” but its meaning is far more profound. Teotl is not a being, but an impersonal, all-encompassing divine force or sacred energy. It is a dynamic, ever-moving, and self-generating power that constitutes all of reality. Everything in the universe—the gods, humans, animals, mountains, rivers, and stars—was an expression or manifestation of teotl. The gods themselves were not creators separate from the universe; they were simply powerful concentrations of this sacred energy.
This philosophy was not one of good versus evil. Teotl was seen as fundamentally amoral. Instead, Aztec philosophy was characterized by a profound sense of duality. They believed that reality was a constant interplay of opposing yet complementary forces: life and death, light and dark, order and chaos, male and female. Neither could exist without the other; they were two sides of the same coin, locked in a perpetual, dynamic struggle that generated the fabric of existence. Life emerged from death, and death was necessary for the continuation of life. This concept was beautifully expressed in art, such as split-faced masks that were half-living flesh and half-skull.
This principle of duality was embodied in their primordial creator deity, Ometeotl, the “God of Duality.” Ometeotl was a single being who possessed both male and female aspects: Ometecuhtli (“Two Lord”) and Omecihuatl (“Two Lady”). This dual god resided in Omeyocan, the highest of the thirteen heavens, a place beyond the turmoil of the mortal world. Ometeotl was a remote, abstract entity who was not typically worshipped directly with temples or sacrifices; instead, this deity was the source from which all other gods and, indeed, all of teotl emanated. From this divine pair sprang the four great Tezcatlipocas, who represented the cardinal directions and who initiated the cycle of the Five Suns.
The language of the People of the Sun was Nahuatl, a member of the Uto-Aztecan language family, which connects them to peoples as far north as the Hopi and Utes of the American Southwest. The name Nahuatl itself is thought to mean “clear sound” or “good sounds.” By the time the Mexica rose to power, Nahuatl, specifically the prestigious dialect spoken in Tenochtitlan, had become the lingua franca of central Mexico. It was the language of government, commerce, and high culture, spoken by nobles, merchants, and diplomats across the empire.
Nahuatl is an agglutinative language, meaning it forms complex words and ideas by stringing together smaller morphemes, or units of meaning. This allows for great nuance and descriptive power. For example, the name of their capital city, Tenochtitlan, is a combination of tetl (rock), nochtli (prickly pear cactus), and -tlan (a suffix meaning “place of”). This structure lent itself to a rich poetic tradition, where concepts of beauty, warfare, and the ephemeral nature of life were explored with profound depth. Even today, the legacy of Nahuatl survives, not only among the more than 1.5 million people who still speak it in Mexico, but also in the English words we use daily, such as avocado (ahuacatl), chocolate (chocolatl), tomato (tomatl), and coyote (coyotl).
The fundamental political and social unit of the Nahua world was the altepetl. The word is a combination of atl (“water”) and tepetl (“mountain”), a metaphorical term signifying a self-governing, ethnically-based community. Often translated as “city-state,” the altepetl was more than just a geographical location; it was the core of a person’s identity. People identified themselves by their altepetl first and foremost. Each altepetl had its own ruler (tlatoani), its own patron deity and temple, a central market, and a distinct origin story that formed the basis of its collective identity.
The Aztec Empire was not a monolithic, centralized state in the modern sense. It was a hegemonic structure built upon this network of individual altepeme. When the Mexica conquered another city-state, they typically did not dismantle its local government. Instead, they would allow the local tlatoani to remain in power, provided he pledged allegiance to Tenochtitlan, paid regular tribute, and contributed soldiers to Mexica military campaigns. This system of indirect rule allowed the empire to expand rapidly, but it also meant that the allegiance of subject peoples was often tenuous, a fact that would have profound consequences when outsiders arrived on their shores.
Thus, to be one of the People of the Sun was to understand one’s place in a universe of breathtaking scale and peril. It was to know that your world was the last of five, born from the sacrifice of gods and destined for a violent end. It was to feel the divine energy of teotl flowing through all things, a world of constant change and clashing, complementary forces. It was to speak the language of power and poetry, to identify with your home city-state, the altepetl, and to serve its ruler. Above all, it was to be a warrior for Huitzilopochtli, a chosen servant of the sun, with the sacred and terrible duty to feed the celestial fire with the hearts of your enemies, all to keep the cosmos in balance and win one more precious day from the encroaching darkness.