In a quiet corner of Rome stands a hill called Monte Testaccio. It is about 35 metres high. It looks ordinary at first. But it is not a natural hill at all. It is made of around 53 million broken pots. Every one of those pots was an amphora — a big two-handled clay jar used to carry olive oil from Spain to Rome. Each amphora held about 70 litres of oil. Each weighed about 30 kg empty and 100 kg full. They were made in Spain, filled with oil, shipped by boat up the Tiber, unloaded in Rome, emptied into smaller jars, and then smashed. The broken pieces were stacked carefully on this spot. Over 200 years, the heap grew into a small mountain. Why so much olive oil? Because Rome ran on it. Olive oil was used for cooking, for lighting lamps, for washing the body, for medicine, and for religious ceremonies. Rome had about one million people. The Roman army had hundreds of thousands of soldiers stationed across the empire. All of them needed oil. So the government built a huge supply system. Farmers in Baetica (modern southern Spain) grew olives. Local potters made the amphorae. Workers filled them, sealed them, and stamped them with the names of estates and inspectors. Ships carried them to Rome. Officials counted and recorded every one. This lesson asks how one heavy clay pot could feed a whole empire, and what a hill of broken pots can still teach us today about how cities are fed.
Because olive oil was not just cooking oil. It was the main lighting fuel — every house lamp burned oil. It was the main washing material — Romans rubbed oil into the skin and then scraped it off, the way modern people use soap. It was a major medicine. It was used in religious offerings. It was given by the state to ordinary citizens as part of the dole — like grain in the famous 'bread and circuses' system. The annona, the Roman state food supply, included olive oil from at least the second century CE. The army needed huge amounts too — Roman soldiers received an oil ration. So olive oil was at the centre of daily life across the empire. The amount needed was enormous. Modern estimates suggest Rome imported at least 7.5 million litres of olive oil a year at the peak, in the late second century CE. That is about 20,000 litres a day. To move that much oil, you needed a planned supply system — and the Dressel 20 amphora was the standard pot at the heart of it. Students should see that 'cooking oil' is the wrong way to think about it. Olive oil was the energy, hygiene, and food backbone of the Roman world.
Because it worked. Once a design solves a problem well, people stick with it. The Dressel 20 was strong, stable, the right size for two people to carry, and made of cheap local clay. The Romans built kilns along the Guadalquivir river in Spain that could make tens of thousands of these pots every year. The shape changed slightly over the centuries — earlier examples are slightly more oval, later ones more round — but the basic design lasted from about 30 CE to about 260 CE. Compare with the modern shipping container, invented in 1956 and standardised in the 1960s. It is still the same basic shape today, 70 years later, because the design works. The Dressel 20 was the Roman version of this. It was the standard unit of bulk oil shipping. Every dock worker, every official, every customer knew exactly what to expect from a Dressel 20. Standardisation is one of the great inventions of trade. Students should see that a 'simple pot' is actually a piece of engineering — a working design that handled a serious job for over 200 years.
Because the supply system was a big bureaucracy. Rome was not feeding itself by accident. The state organised the oil supply with care. Olive oil was bought from estates as a tax in kind. Officials inspected the oil at the source, at the docks in Spain, on the ships, and at the docks in Rome. Without a paper trail, fraud and theft would have been easy. The stamps and inscriptions made every amphora trackable. Today, archaeologists can still read these markings. They have built up huge databases of estates, merchants, officials, and consular dates. The German scholar Dressel started this work in 1872. Modern Spanish, Italian, and British scholars continue it. From a single hill of broken pots in Rome, scholars have rebuilt much of the Roman olive oil trade — who grew the olives, who shipped them, who weighed them, who ate them. The pots are like an ancient ledger written in clay. Students should see that 'ancient' does not mean 'simple'. The Roman supply system had bureaucracy, paperwork, and quality control — all written on the pots themselves.
That an empire leaves more behind than buildings and books. Rome wrote the famous histories of Tacitus and Livy. Rome built the Colosseum and the aqueducts. But Rome also left an ordinary hill of broken pots, and that hill tells us things the books do not. The books tell us about emperors and wars. The pots tell us about farmers, potters, sailors, dock workers, inspectors, cooks, lamp-fillers. The pots tell us about the daily food of a city of one million. The pots tell us about the labour of Spanish farms, many of them worked by enslaved people, that fed people in Rome they would never see. Students should see that history is not only about the rich and famous. The 'ordinary' supply system that fed Rome was the real engine of the empire. And the proof is still there, in a hill of clay, in the middle of Rome, where it has stood for nearly 2,000 years. End the discovery here.
The Roman olive oil amphora (Dressel 20 type) was the standard shipping pot of the Roman olive oil trade between about 30 CE and 260 CE. Made in southern Spain, it held about 70 litres of oil, weighed 30 kg empty and 100 kg full, and was stamped and labelled at every step of its journey. The pots carried oil to Rome, to the Roman army, and to cities across the empire. In Rome, the empty pots were smashed on a single site, and over 200 years the broken pieces grew into a hill 35 metres high — Monte Testaccio — made of around 53 million pots and holding the trace of 6 billion litres of oil. The hill is still there today. The pots and their markings are still being studied. The Dressel 20 was a piece of standard engineering that helped feed a city of one million people for two centuries.
| Date | Event | What changed |
|---|---|---|
| Around 30 CE | Standard Dressel 20 form develops in Spain | The Roman olive oil trade gets its main shipping container |
| 50-250 CE | Peak of the Spanish olive oil trade with Rome | Tens of millions of amphorae travel from Spain to Rome and the army frontiers |
| Around 140 CE | Organised dumping at Monte Testaccio begins | Broken amphorae are stacked in careful terraces, building up a hill |
| Around 260 CE | Dressel 20 production ends | North African oil replaces Spanish; smaller amphorae take over |
| 1872 | Heinrich Dressel begins studying Monte Testaccio | The first scientific classification of Roman amphorae is published |
| 1960s onwards | Modern Spanish, Italian, and British excavations | Scholars rebuild the Roman olive oil trade from the pots themselves |
| Today | Monte Testaccio is fenced off and protected | The hill stands as a working archive of the ancient food supply |
The Romans used olive oil only for cooking.
Olive oil was used for cooking, but also for lamps (the main lighting fuel), for washing the body, for medicine, and for religion. It was the central fat and fuel of Roman life.
Calling it 'cooking oil' makes the Roman demand for it sound small. The real demand was enormous — at least 7.5 million litres a year for Rome alone.
Roman amphorae were luxury items.
Amphorae were cheap, mass-produced shipping containers — the ancient version of cardboard boxes or oil drums. The Romans made tens of thousands every year and broke them once empty.
'Ancient pottery' often sounds like art. These pots were working tools, not treasures.
Monte Testaccio is a natural hill.
It is a fully artificial hill made of broken pots — about 53 million of them, built up over 200 years of organised dumping. The terraces, retaining walls, and lime layers all show careful Roman planning.
'A hill of broken pots' sounds too unusual to be true. It really is.
The Romans grew all their own food.
Rome was a huge importer of food. Olive oil came from Spain, grain from Egypt, fish sauce from many places. The empire was a working economy that moved food across thousands of kilometres.
Picturing ancient Rome as self-sufficient hides the supply networks that actually fed the city.
Treat the Roman olive oil amphora as both a piece of impressive engineering and a piece of a colonial supply system. The Romans built an empire by force, taxed the conquered, and used enslaved labour throughout. Be honest about this without making the lesson a one-sided lecture. Use the Latin words where appropriate — amphora, Dressel 20, Monte Testaccio, annona, tituli picti, Baetica — and pronounce them simply. 'Amphora' is roughly 'AM-for-ah'. 'Baetica' is roughly 'BAY-tih-kah'. 'Dressel' is roughly 'DRESS-el'. Be careful with the slavery content. Much of the work in Roman agriculture and trade was done by enslaved people — in Spain, in Rome, and on the ships. Mention this clearly. Do not turn it into the only point of the lesson, but do not let it disappear. If students of Mediterranean heritage are in the class, give them space to share but do not put them on the spot. Many parts of the Mediterranean world still produce olive oil today — Spain, Italy, Greece, Tunisia, Morocco, Palestine, Lebanon — and many students may have family connections to this work. Avoid romanticising ancient Rome. The empire built impressive things, but at a real cost to the conquered peoples. Be balanced. End the lesson on the modern relevance. Modern food supply chains have many of the same features — long distances, standard containers, paper trails, central control — and some of the same problems with labour and fairness. The amphora helps us think about how cities get fed, then and now.
Answer each question in one or two sentences. Use what you have learned about the Roman olive oil amphora.
What is a Dressel 20 amphora, and what did it carry?
Why did the Romans need so much olive oil?
What is Monte Testaccio?
What information was written on a Roman amphora?
What can broken pots teach us that emperors' writings cannot?
These questions have no single right answer. Talk in pairs or small groups, then share your ideas with the class.
The Romans built a huge supply system to feed one million people. Modern cities also have supply systems. What do the two have in common, and what is different?
Much of the work behind the Roman olive oil trade was done by enslaved people. Does this change how we should think about Roman engineering?
Monte Testaccio is a hill of rubbish, but it tells us more about ancient life than many famous monuments. What 'rubbish' from our own time might teach future people about us?
Your feedback helps other teachers and helps us improve TeachAnyClass.
