Deinham Danube Iron Bars: Europe’s Largest La Tène Iron Cargo

A hoard of roughly 500 bipyramidal Deinham Danube iron bars—about a metric ton of La Tène semi-finished iron—recovered from a Danube gravel pit at Deinham near Hartkirchen, Upper Austria, is the largest prehistoric iron-bar assemblage yet published in Europe. Peter Trebsche and Marion Berranger report the find in open-access Antiquity (doi:10.15184/aqy.2026.10404), with coverage this week from Live Science and related press.

Divers and excavators lifted the bars from river gravel in 2019; many still show the classic double-pointed “bipyramidal” shape used as stock for forging. The authors argue the pile most likely represents transport loss—cargo from a river craft that never reached its destination—though no wreck was found and ritual deposition is not fully excluded. Equivalence talk (enough iron for hundreds of swords or thousands of nails) is a useful scale check, not evidence the load was destined for an army.

Provenance toward Bavaria / the Manching region is plausible on typology and trade geography but unproven without broader chemical matching. Framed firmly as a La Tène industrial-transport story on the Danube corridor, the assemblage reframes how much finished iron could move in a single prehistoric shipment—and how much of that traffic may still lie in river beds.