Ancient Trade Insights from a 2,000-Year-Old Iron Haul

The Late Iron Age marked significant advancements in iron production and craftsmanship across various cultures. Despite this, archaeologists have faced challenges in determining the precise scale and routes of the iron trade in Europe due to iron’s tendency to corrode and the difficulty in dating it. a recent discovery, described by researchers as a “minor miracle,” may change our understanding.

In the spring of 2019, workers clearing gravel in Deinham, an Austrian town along the Danube River, noticed their excavator repeatedly retrieving unusual, double-pointed iron objects. They promptly reported their findings to local authorities, who sent a team of experts to investigate. The archaeologists were astonished to uncover 540 fragments of double-pointed iron bars, a type of iron fabrication widely exchanged during the European Iron Age. This collection was analyzed and the findings were published in the journal Antiquity.

Peter Trebsche, the primary author of the study and an archaeologist from the University of Innsbruck in Austria, shared with Gizmodo that this represents the “largest known mass find of iron bars” in Europe. He emphasized the surprising fact that such a substantial quantity of iron—approximately 1 ton—was “transported at once and was available in a single exchange transaction.”

Significant Archaeological Discovery of Iron Bars

The Deinham trove comprises 540 fragments of double-pointed, or bipyramidal, iron bars. the site yielded 90 other artifacts from various time periods, dating from as early as the 8th century BCE to the 1900s. Trebsche noted that the bars are about 11 inches (28.5 centimeters) long and weigh between 3.5 and 5.3 pounds (1.6 to 2.4 kilograms). Their shape resembles that of a willow leaf, featuring one pointed and one flat end.

Trebsche commented on the challenges faced during the excavation, stating, “A major challenge was the fact that most iron bars were still covered with gravel and sand, which we were unable to remove. Fortunately, about one third of all bars had already been ‘cleaned’ by the gravel crusher in the gravel plant.”

Radiocarbon dating revealed that the bars date back to the La Tène period (between 450 and 1 BCE), a time associated with the Iron Age culture in what is now central and western Europe, prior to Roman conquest. While the exact circumstances surrounding the large cache of iron remain unclear, it is plausible that it was being transported for trade along the river and ended up submerged due to a shipwreck.

What Was the Economic Impact of This Iron Trove?

Another objective of the study was to assess the economic value of this substantial iron find. Trebsche explained that the iron bars were considered semi-finished products, intended for further forging into final goods. This aspect significantly influences the overall value of the collection. For instance, one ton of iron could be forged into approximately 500 swords weighing between 3 to 4 lbs (1.5 to 2 kg), as detailed in the study.

One ton of iron could create around 8,000 iron nails. Theoretically, such a quantity of nails could “fix the entire wooden framework in the southern wall” of the nearest oppidum, a type of fortified settlement from the European Iron Age, as noted in the research. The logistics involved in transporting this substantial amount of iron suggest that a trading partner would have needed to offer equally valuable items in exchange, such as a dowry, military service, slaves, livestock, or other precious metals like gold and silver.

What Further Insights Can We Expect from Ongoing Research?

The loss of the shipwreck represented a significant financial setback, yet it also highlights the increasing capabilities in iron production and the extensive trading networks of the period, according to Trebsche.

“It is fascinating to observe how the monetization facilitated, or perhaps even prompted, transactions of this scale,” he remarked.

Given the remarkable size of the iron find, the research team continues to analyze the samples. Several questions remain unanswered, according to Trebsche. For example, were the bars manufactured in a single workshop? How did ironworkers source their raw materials? Addressing these inquiries will hopefully provide deeper insights into the technological advances and trade practices of that era.