10 Aztec History Facts, Each With a Source You Can Check

The most surprising Aztec history facts are about daily life and about what we still don't know. The Aztecs called themselves Mexica, paid for tomatoes with cacao beans, and farmed on gardens built out into a lake. Their great temple was lost under Mexico City until electrical workers hit a carved stone in 1978. Even the founding year of their capital depends on which source you read. Below are ten facts, each with the source we checked, plus a short note on how each could work as a video.

If you want more from other periods, see our medieval history facts and weird history facts.

10 Aztec history facts, with sources

1. They didn't call themselves Aztecs

The people we call Aztecs called themselves Mexica (also Tenochca). According to History.com, the word "Aztec" comes from Aztlan, or "White Land" in Nahuatl, the homeland they said they came from. The name Mexica stuck harder: it became the name of Mexico City and of the country.

Video angle: open with the name. "The Aztecs never called themselves Aztecs" is a hook that makes people stay for the explanation.

2. Nobody agrees on the year Tenochtitlan was founded

A page from Mexico's environment ministry, SEMARNAT, says the Mexica founded Tenochtitlan in 1325, as their god Huitzilopochtli ordered. The World History Encyclopedia gives the traditional founding date as 1345. Both are traditions recorded long after the fact, so a careful script says "around the 1320s to 1340s" or names both dates.

Video angle: a "how do we know" video. Show the two dates side by side and explain how historians work with sources written after the events.

3. The eagle eating a snake may be a later addition

The founding legend says the Mexica would settle where they saw an eagle on a prickly pear cactus. SEMARNAT describes the scene with the eagle tearing at a snake, the image on Mexico's flag today. But a 2021 release from Mexico's Ministry of Culture on a book by historian Guillermo Correa Lonche says the eagle devouring a snake "is not an image present in the pre-Hispanic sources." His hypothesis is that it was built in the late 1500s to early 1600s. That's one scholar's argument, not settled fact, and the two government pages disagree with each other.

Video angle: a myth-check on a national symbol. The tension between two official sources is the story.

4. Tenochtitlan was one of the largest cities in the world

The World History Encyclopedia says the city had over 200,000 residents and covered about 12 to 14 square kilometres. It sat on an island in Lake Texcoco, linked to shore by three causeways with removable bridges, and a stone aqueduct brought fresh water from springs near Chapultepec Hill. History.com gives a lower figure, more than 140,000 people at its height. Population numbers for cities this old are estimates, so give a range.

Video angle: a city tour. Walk the viewer across a causeway into the city with maps and illustrations.

5. They grew food on gardens built into the lake

To feed that many people, the Mexica used chinampas, which the World History Encyclopedia calls "floating gardens": beds of mud held in place with willow trees, built out into the shallow lake. They weren't really floating. They were anchored plots surrounded by canals.

Video angle: an engineering video. Show how a plot is built layer by layer, then show how canals ran between the plots.

6. Cacao beans worked as small change

The Aztecs didn't use coins for everyday buying. Cacao beans did the job. Mexicolore lists prices from a 1545 document from Tlaxcala, written about 24 years after the conquest: a large tomato for 1 bean, a small rabbit for 30, a good turkey hen for 100 full beans (or 120 shrunken ones), and a turkey cock for 300. A freshly picked avocado cost 3 beans and a fully ripe one cost 1.

7. People counterfeited the beans

Where there's money, there's fake money. The same Mexicolore article says some sellers made fake beans from wax or amaranth dough, and quotes the Florentine Codex describing a seller who "counterfeits cacao." The World History Encyclopedia adds that some beans were hollowed out and filled with sand.

Video angle for 6 and 7: "What things cost in the Aztec market." Put the price list on screen and end with the counterfeiters.

If you'd rather make videos than read about it, VidPuff turns a title into a faceless video. No waitlist, cancel anytime.

8. Electricians found the Great Temple in 1978

After the conquest, the Templo Mayor, the main temple of Tenochtitlan, was sacked and built over. It stayed buried until the early hours of 21 February 1978, when workers from the power company Compañía de Luz y Fuerza del Centro were digging between Argentina and Guatemala streets in central Mexico City. They struck a huge carved stone of the moon goddess Coyolxauhqui, according to Mexico's National Institute of Anthropology and History (INAH). The find started the Templo Mayor Project.

Video angle: a discovery story. Start with a routine night shift and a shovel hitting stone.

9. A tower of skulls held women and children too

Near the Templo Mayor, archaeologists have dug up part of the Huey Tzompantli, a rack and tower of human skulls. Smithsonian Magazine reported in July 2017 that the team had found more than 675 skulls and that researchers think it was built between 1485 and 1502. The surprise was that the skulls included women and children, not only male warriors. The same article says the conquistadors Bernal Díaz del Castillo and Andrés de Tapia claimed it held over 100,000 skulls, a number scholars consider a big exaggeration.

Video angle: handle this one with care. Focus on what the archaeology shows and how it changed what researchers thought, not on shock.

10. Smallpox did as much as the siege

Hernán Cortés and his men reached Tenochtitlan in November 1519, and the city fell on 13 August 1521. History.com notes that by 1520, smallpox had cut the city's population by 40% in a single year. The Aztecs left their language behind in English, too: chocolate, avocado, chili, and coyote all come from Nahuatl.

Video angle: the fall told from inside the city, with the epidemic as the turning point most people don't know about.

Why Aztec history works on YouTube

Aztec history facts have what a long video needs: a strong hook, a visual setting (a city on a lake), and open questions you can explore instead of hiding.

History content also sits in a well-paid ad category. In AIR Media-Tech's study of 300 monetized channels (May 2025 to May 2026), Education & Science had the highest median RPM at $10.22 per 1,000 views. That's a category median, not a promise. Our YouTube niche RPM data post shows how wide the range is.

A few rules for scripts about the Aztecs:

• Name both numbers when sources disagree. Founding year and population are the common ones.
• Treat sacrifice and conquest with care. These are real people, and many viewers have family ties to this history.
• Use Mexican sources. INAH and Mexico's government pages are free to read and often go deeper than English summaries.

Making an Aztec history channel

Most history channels are faceless, with narration over maps, codex images, and illustrations. You can build these by hand in an editor, or with VidPuff: type a title like "What Things Cost in the Aztec Market" and it writes the script, generates narration, creates a visual for each scene, adds music and captions, and renders a long-form 16:9 video. You review each stage and can change the script, voice, images, and music. Check every claim against your sources before you publish. Our guide on how to make a faceless YouTube channel covers the setup.

FAQ

What are 5 interesting facts about the Aztecs?

They called themselves Mexica, their capital Tenochtitlan had well over 100,000 people on an island in a lake, they grew food on chinampa gardens, they used cacao beans as small change, and their main temple was rediscovered by electrical workers in 1978.

When was Tenochtitlan founded?

Traditional dates differ. Mexico's SEMARNAT gives 1325, and the World History Encyclopedia gives 1345. Both come from accounts written after the founding.

What did the Aztecs use for money?

Cacao beans for small purchases. A 1545 price list from Tlaxcala gives a large tomato at 1 bean, a small rabbit at 30, and a good turkey hen at 100. Beans were common enough that people faked them with wax or dough.

How did the Aztec empire end?

Spanish forces under Hernán Cortés besieged Tenochtitlan, and it fell on 13 August 1521. A smallpox epidemic in 1520 had already killed a large share of the city's population.