Teotihuacan was one of the ancient world’s biggest cities, and we still do not know its real name

Somewhere north of modern Mexico City sit the remains of a city that once rivaled anything else on the planet in scale, yet nobody today can say with certainty what its own residents called it. Massive pyramids, a grid of avenues, and a population in the tens of thousands all survive in stone. The name its builders used for it does not.

Visitors walking the site today see wide processional roads, terraced pyramids, and the remains of apartment-style residential compounds packed close together, all evidence of a metropolis built with real urban planning rather than haphazard growth. Yet none of the inscriptions, murals, or burial goods recovered from those structures has ever produced a confirmed label the city’s own people used to describe their home, leaving modern researchers to rely on a name assigned centuries after the city had already gone quiet.

A City Bigger Than Its Fame Suggests

At its height in the 4th century CE, the urban core stretched across roughly 8 square miles and supported a population estimated at more than 100,000 people, according to Wikipedia’s overview of the site. That put it among the largest cities anywhere in the world at the time, comparable in scale to major urban centers in the Roman Empire and far larger than most other settlements in the Americas during the same period. The layout centers on the Avenue of the Dead, a broad processional road running past the city’s largest monuments, including the Pyramid of the Sun and the smaller Pyramid of the Moon, structures that remain among the largest pyramids ever built in the pre-Columbian Americas.

The scale of construction extended well beyond the two largest pyramids. Excavations across the site have mapped hundreds of smaller platforms, courtyards, and multi-family apartment compounds, many decorated with painted murals depicting deities, animals, and processions rather than the rulers commonly celebrated in other Mesoamerican art traditions. That relative absence of glorified individual leaders in the surviving artwork has itself become a point of scholarly discussion, since it stands apart from the ruler-centered imagery common at contemporary Maya sites farther south.

Builders Whose Identity Remains Uncertain

Despite the city’s scale, the people who built and ran it left behind no confirmed written language, and their ethnic or linguistic identity has never been settled by archaeologists. Competing theories have linked the population to various Mesoamerican groups, but no single identification has gained universal acceptance, according to Britannica’s entry on the city. That absence of a clear textual record stands in contrast to other major Mesoamerican civilizations, such as the Maya, whose hieroglyphic writing has given historians a far more direct window into political history and rulership.

Without deciphered texts from the city’s own inhabitants, most of what is known about daily life, governance, and religious practice at Teotihuacan comes from archaeological excavation rather than written testimony, including burial sites, murals, and the layout of residential compounds that suggest a highly organized society with distinct neighborhoods tied to craft specialties and possibly ethnic origin.

Why the Name Is an Aztec Invention

The name used today, Teotihuacan, did not come from the city’s builders at all. It was assigned centuries later by the Aztecs, who encountered the site already abandoned and in ruins when they arrived in the region, and interpreted its scale as evidence of a place built or favored by the gods. The name is generally translated as something close to “the place where the gods were created” or “the birthplace of the gods,” reflecting Aztec mythology rather than any label used by the city’s original population, according to National Geographic’s history coverage of the site. By the time the Aztecs arrived, Teotihuacan had already been abandoned for roughly 700 years, meaning the name attached to the ruins reflects a much later civilization’s interpretation of an older, unrelated society.

Whatever term the city’s founders and residents used to describe their own home has not survived in any deciphered form, and no glyphs or inscriptions recovered from the site have provided a confirmed self-designation, leaving the question open even after more than a century of organized excavation.

A Collapse Almost as Mysterious as the Name

Teotihuacan’s decline is nearly as debated as its founding. Archaeological evidence points to a period of destruction and burning at major monuments around the 6th century CE, which some researchers interpret as evidence of internal uprising against the ruling elite, while others point to drought, resource strain, or external conflict as contributing factors. No single account has been confirmed as the definitive cause, leaving the city’s ending, much like its true name, as an open question rather than a settled fact.

What remains undisputed is the physical evidence still standing on the site: a planned metropolis capable of housing well over 100,000 people, built with an ambition that outlasted the civilization responsible for it by centuries, and inherited by later cultures who could only guess at what to call it.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

More from Morning Overview