Not so much a mystery as a well-studied puzzle
The Hallstatt culture is one of the better-documented societies of prehistoric Europe. It is named after Hallstatt, a small town on a lake in the Salzkammergut region of Upper Austria, where a large Iron Age cemetery and ancient salt mines were found in the nineteenth century. What remains debated is not whether these people existed but how to describe them: what language they spoke, how far they formed a single “culture”, and how they relate to the peoples that Greek and Roman writers later called Celts.
Archaeologists use the name for the early phase of the European Iron Age, usually dated from about 800 to 450 BCE. It is a label for a recognisable set of burial customs, metalwork and pottery found across a wide belt of central Europe, from eastern France through southern Germany and Austria to Slovenia and western Hungary. There was no known single state or capital.
Salt, the reason for the wealth
Salt was valuable in prehistory because people and livestock need it, and because it preserves meat, fish and hides. At Hallstatt the salt is not in seawater but in rock, deep inside the mountain above the town. Miners dug galleries and shafts into it. Hallstatt salt mining began in the Bronze Age, probably by the middle of the second millennium BCE, and continued in the Iron Age. The scale of the work in the centuries around 800 BCE is one reason the site is so important.
The mountain has an unusual advantage for researchers: salt preserves organic material that would normally rot. Finds from the mines include wooden tools and stairways, leather and fur items, textile scraps, and the remains of torches. Some textiles are woven in patterned and coloured wool, which gives a rare view of everyday clothing. Analysis of preserved human waste from the mines has also been used to reconstruct what the miners ate, and researchers have reported grains, beans and fermented foods in the mix. Treat the finer details of such studies with some caution, as interpretations are still being refined.
Mining was hard and sometimes dangerous. A mudslide is thought to have buried part of the Bronze Age workings, and work later resumed elsewhere in the mountain. The miners worked in tight, dark galleries lit by wooden torches.
The cemetery that named an era
In 1846 a mining official named Johann Georg Ramsauer began excavating graves on a plateau above the town. Over the next years he recorded close to a thousand burials, and he made drawings and notes that are still used today. The finds gave archaeologists a large, relatively consistent set of objects from a single community, and the name Hallstatt was later applied to the whole early Iron Age phase in central Europe.
The graves include both cremations and inhumations, and they vary in richness. Some contain bronze vessels, jewellery, amber and glass beads, and long swords. Others contain little. That range suggests a society with real differences in wealth and rank, though it is hard to say how rigid the hierarchy was or how far it was inherited.
Chronologies for the culture are often divided into earlier and later phases. Early Hallstatt is often associated with a transition from bronze to iron tools and weapons, a change tied to the wider ironworking spread across Europe. Later Hallstatt, from roughly the seventh century BCE, includes burials of especially wealthy people.
Trade and the wider world
Salt was probably one of several goods moving along river valleys and mountain passes. Hallstatt graves contain amber, which came from the Baltic, and the amber trade routes that crossed Europe connected Alpine communities to distant regions. Other graves contain items such as glass beads and bronze vessels that came from, or were inspired by, Mediterranean workshops.
In the later phase, a group of fortified hilltop centres and rich “princely” burials appeared further west. Well-known examples include the Heuneburg hillfort in southern Germany, where part of the defences was built in a mudbrick style unlike local custom, and the burial of a person at Hochdorf, who was laid out on a bronze couch with a wagon and drinking equipment, around the later sixth century BCE. Greek and Etruscan goods reached such centres, and the Etruscan civilization to the south was one of the trading partners that shaped them. These western sites are sometimes called the “western Hallstatt zone”, while Hallstatt itself belongs to the eastern group.
Were they Celts?
Greek writers, beginning around the fifth century BCE, mention a people called the Keltoi living in central and western Europe, and some of these references place them near the upper Danube. Because the Hallstatt region and the later Iron Age cultures of the same area are connected, many scholars regard Hallstatt communities as ancestors, or at least early relatives, of those later named Celts. Others warn that archaeological cultures are not the same as peoples or languages, and that ancient writers used “Celt” loosely. The sensible position is that Hallstatt is often described as proto-Celtic or early Celtic, and that this is an inference rather than a proven fact. The later Iron Age Celtic tribes that Rome met are better documented.
Around the middle of the fifth century BCE the style of objects began to change. A new tradition with flowing, curved decoration, known as the La Tene style, spread through the same broad region and replaced the Hallstatt forms. Many of the princely centres declined at about the same time. Why this happened is debated, with explanations involving shifting trade routes, changing power relations and local conflicts. Salt mining at Hallstatt itself seems to have declined around this period, and it was taken up again in later centuries.
How we know the dates
Dates for the Hallstatt culture come from several methods. Radiocarbon dating gives broad ranges for organic material, but the plateau in the radiocarbon calibration curve around the early Iron Age makes precise dating of this period tricky. Where timbers survive, tree-ring dating can fix a felling date to a single year, and the preserved wood in the salt mines has been important for that purpose. Typology, the study of how styles of brooches, swords and pots changed, remains the basis of the traditional sequence.
A landscape, not just a site
Hallstatt is a UNESCO World Heritage Site, listed in 1997 together with the surrounding Dachstein and Salzkammergut landscape. Modern salt production continues nearby, and the old town is now a popular destination. For archaeologists the lasting value of the place is the combination of preserved workplaces, a large cemetery and a long timeline in one valley. That combination makes it possible to ask questions about work, health, status and trade in an Iron Age community, even if many answers remain tentative.