San Lorenzo Tenochtitlán – The First Olmec Centre

San Lorenzo Tenochtitlán is the collective name for San Lorenzo, Tenochtitlán (not to be confused with the Aztec Tenochtitlán) and Potrero Nuevo, a collection of ancient sites which culminate the major centre of Olmec culture from 1200 BC to 900 BC.

“San Lorenzo Tenochtitlán” was coined by archaeologist Matthew Stirling in 1955, who begun excavating the area in 1938, and named the cluster of settlements after the nearby present-day villages.

The Olmec are the earliest known Mesoamerican civilisation (also referred to as the “mother culture” of Mesoamerica), having emerged in the present-day Mexican states of Veracruz and Tabasco during Mesoamerica’s formative period (1800-900 BC), with the subsequent periods being defined as the Middle Formative (900-400 BC), and the Late Formative (400 BC-AD200).


The rise of the Olmec at San Lorenzo Tenochtitlán can be associated to the local ecology of well-watered alluvial soil that supported a rich agricultural system, as well as by the transportation network provided by the Coatzacoalcos river basin that encouraged the permanent settlement and development of the first Olmec centre that demonstrated a level of state complexity.

A map of the Olmec heartland. The yellow sites are known Olmec villages and towns. The smaller red dots mark locations where artifacts or art have been found unassociated with habitation. – GNU Free Documentation License,

The site is situated on a plateau where the elites lived in large structures raised on low clay platforms. The common folk lived on the slopes of the plateau in thatched wattle–and-daub houses, stepping down to a level 40m below the summit to the lowland farmland that encircled San Lorenzo.

The summit also contained monumental stone thrones and colossal heads, representing leaders from a society based on a chiefdom-level of organisation. The heads were carved from large boulders transported over 93 miles from the Sierra de Los Tuxtlas mountains on the south-eastern Veracruz Gulf coast, and eventually placed in linear lines running across the site forming a possible processional route.

Olmec Head 8 from San Lorenzo Tenochtitlán – Image Credit: Adam Sk – CC BY-SA 3.0

The movement of the giant boulders and exotic raw materials brought into San Lorenzo from distant regions, as well as the export of various types of pottery and figurines to other areas in Mesoamerica, suggests that the early Olmec controlled a large trading network.


San Lorenzo continued to be occupied until the 10th century BC, with its decline coinciding with the rise of the Olmec centre of La Venta in Tabasco. There are various theories for the abandonment, with researchers proposing localised warfare, environmental changes, economic decline, and the emergence of rival centers, although multiple causes are also likely.

Header Image – San Lorenzo Colossal Head 6 – Image Credit: Luidger – CC BY-SA 3.0


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Markus Milligan
Markus Milligan
Mark Milligan is an award winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 7,000 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW) and in 2023 was the recipient of the British Citizen Award for Education and the BCA Medal of Honour.




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