Eagle on a cactus
The sign of the founding of Tenochtitlan: an eagle on a prickly pear cactus growing from a rock in a lake. For the Mexica it marked where their god Huitzilopochtli told them to settle; it is now the coat of arms on the flag of Mexico.
Meaning
Mexico’s law on the national symbols describes the coat of arms: a Mexican eagle in left profile, its left talon on a flowering nopal cactus that grows from a rock rising out of a lake, holding a curved serpent in its right talon and beak, framed by branches of oak and laurel. The flag carries it at the centre of the white stripe, between green and red. The archaeologist Eduardo Matos Moctezuma writes that for the Mexica the eagle stood for the sun and for Huitzilopochtli, and the name Tenochtitlan itself means, in Ismael Arturo Montero García’s translation, “the place of the cactus on the rock”.
Origin and history
INAH gives the year as 2 House, AD 1325, when the wandering Mexica saw the sign promised to them, though the sources give dates between 1325 and 1375. One story, Xavier Noguez writes, makes the rock the place where the heart of Cópil, Huitzilopochtli’s nephew, fell after his sacrifice, and the cactus grew from his heart. Matos cites José Corona Núñez, who read both the rock and the cactus fruit as hearts.
The only image made before the conquest is on the back of the Teocalli of the Sacred War, carved about 1507 under Moctezuma II and now in the Museo Nacional de Antropología. There the eagle on the cactus holds in its beak not a serpent but the atl-tlachinolli, the Nahua sign of water and fire that means war. After the conquest the sign stayed in use: plate 1 of the Codex Mendoza shows Tenochtitlan divided in four with the eagle on the cactus at the centre.
The eagle and the serpent
The serpent has been a question for scholars. Noguez notes that some codices, the Codex Mendoza and the Tira de Tepechpan, show the eagle holding nothing, and a second painting in Durán’s Historia shows it eating a bird. Many writers have seen the serpent as a Christian addition, the eagle as good and the serpent as evil, on the strength of the Teocalli; Noguez answers that a broken extension beside its war sign may once have been part of a serpent’s body. Matos points out that the war sign itself “could be mistaken for a serpent”.
On the flag today
The water and rock glyphs of the Mexica codices went onto the coat of arms only in 1968, Noguez writes, and the current description is in the law of 1984. In 2025 Mexico City marked 700 years since the founding with a scale model of the Teocalli at the north-east corner of the Zócalo, INAH reports.
See also
Huitzilopochtli, Eagle warrior, Snake symbolism, Quetzalcoatl (the feathered serpent), Tlaloc, Tezcatlipoca (smoking mirror).
Sources
- Ley sobre el Escudo, la Bandera y el Himno Nacionales (Cámara de Diputados), Ley sobre el Escudo, la Bandera y el Himno Nacionales, Diario Oficial de la Federación, 8 February 1984, consolidated text with reforms to 21 July 2025, arts. 2–3, Cámara de Diputados del H. Congreso de la Unión, arts. 2–3
- El escudo nacional (Xavier Noguez, Arqueología Mexicana), Xavier Noguez, “El escudo nacional”, Arqueología Mexicana no. 145, Arqueología Mexicana (Editorial Raíces / INAH), article text
- El México prehispánico y los símbolos nacionales (Eduardo Matos Moctezuma, Arqueología Mexicana), Eduardo Matos Moctezuma, “El México prehispánico y los símbolos nacionales”, Arqueología Mexicana no. 100, pp. 46–53, Arqueología Mexicana (Editorial Raíces / INAH), article text
- Erigirán memorial del Teocalli de la Guerra Sagrada para conmemorar 700 años de México-Tenochtitlan (INAH), Instituto Nacional de Antropología e Historia, boletín, 2025, Instituto Nacional de Antropología e Historia, bulletin text
- Fundación de México-Tenochtitlan: origen de una ciudad, símbolo de una historia (INAH, foto del día), Instituto Nacional de Antropología e Historia, foto del día, 2025, Instituto Nacional de Antropología e Historia, photo note
- Libro propone que fundación mítica de Tenochtitlan debió ocurrir en torno al solsticio de invierno (INAH), Instituto Nacional de Antropología e Historia, boletín, 2025, on Ismael Arturo Montero García, Entre el cielo y el lago, Instituto Nacional de Antropología e Historia, bulletin text
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Last reviewed October 3, 2026 by Rory Hansen. How we research
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