Exhibition showing salt production in Museo do Mar in Vigo, Spain. Source: Natalia Klimczak

Salt: Treasure of the Ancient World and Highly-Valued Currency of the Roman Empire

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Salt was one of the greatest treasures of the ancient world. Production facilities dedicated to the mineral provided work for many people, but now most of the sites are destroyed or hidden deeply under the ground and buildings of modern cities. However, there are still a few impressive sites which document the work of people who produced an ancient symbol of luxury.

Nowadays, most people cannot imagine their lives without salt. It is used in many different parts of daily life and is in everything from food to cosmetics. Moreover, the tradition of the use of the salt is very old. In ancient times a person who owned a salt production site was very wealthy.

100 AD Roman miniature salt dish.

100 AD Roman miniature salt dish. ( Carl Guderian /CC BY NC SA 2.0 )

The Oldest Known Salt Production Site

The oldest known salt production site is located in the city of Provadia, Bulgaria. It is also believed to be one of the oldest cities in Europe. The site, now called Solnitsata was settled about 4,500 years BC. The economy of the circa 350 population was based on the production of salt. Researchers believe that the small town supplied all the Balkans with their salt.

Reconstruction of the fortified city of Solnitsata, Bulgaria, 4700 - 4200 BC.

Reconstruction of the fortified city of Solnitsata, Bulgaria, 4700 - 4200 BC. (Kenny Arne Lang Antonsen/ CC BY SA 4.0 )

Apart from Europeans, the Chinese, Hittites, Hebrews, and other civilizations also valued salt, but this article will focus on European examples. It is unknown who used salt first, but it is very possible that humans were using it long before written texts existed.

Salt was very popular in the Roman Empire and early Roman Republic. The Roman Legions sometimes also used salt as currency. Due to the high value of salt, an ancient Roman proverb said that people who did their job well were “worth their salt.” (Or “worth their weight in salt.”)

Roman Wooden Tools Used for Salt Mining, Ocna Mures (Alba Iulia National Museum of the Union, 2011).

Roman Wooden Tools Used for Salt Mining, Ocna Mures (Alba Iulia National Museum of the Union, 2011). (Codrin.B/ CC BY SA 3.0 )

In ancient Rome, people created salty ponds in sunny spaces. These could be used to make small salt “factories” for specific people. A person who had a salt pond or pool would be known as one of the richest people in their community.

Salt is a very strong metaphor in the Bible - which further stresses its importance in the ancient word. For example, Jesus said “you are the salt of the earth.” In the Old Testament salt has a ritual meaning. In another part of the Bible Jesus tells his followers to have salt within them. Salt appears in many parts of the Bible as a symbol of wealth or something that is very important.

Even when the Roman Empire’s domination was coming to an end the symbol and importance of salt stayed alive. It was stronger than any change in the world. Salt became one the most important trade items - which allowed for changes in the ancient economy and spreading of trade routes. With time, salt extraction methods also evolved.

Diorama of an underground salt mine in the in the Deutsches Museum in Munich.

Diorama of an underground salt mine in the in the Deutsches Museum in Munich. (High Contrast/ CC BY 3.0 )

The Secrets of Salinae

There is a unique museum below street level in the basement of one of the buildings in the heart of Vigo, Spain. It is a complete and well preserved section of a site where people obtained salt centuries ago - in Roman times.

Most of the ancient site where the salt was produced is currently under the modern city of Vigo, however, a small section is now known as Salinae. It's a small museum which belongs to the Museum of the Sea (Museo do Mar). This marine salt production site is one of the best preserved of its kind around the world. Moreover, the way information is presented in the museum allows one to understand more about the people who obtained the ancient treasure.

The site was excavated in 1998 during preparations to construct a new building in the city center. Ten years later, the local officials were able to open a museum which tells the forgotten story of the salt culture in the ancient Roman city of Vicus (now Vigo).

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