The museum’s most ancient collections date back to the Bronze Age (2300/800 BC).
It is during this period that this copper and tin alloy began to be used, offering many manufacturing possibilities. This had an impact on society as bronze facilitated the creation of new types of objects (pins, fibula brooches and razors) and new weapons (axes, daggers and swords). It also helped to establish a class of rulers.

Most of the objects exhibited at the museum come from Seine-Maritime and Eure, and were primarily found in hiding places (deposits of objects gathered voluntarily).

The Iron Age (800/25 BC) corresponds to the Gallic period.
These collections are represented predominantly by objects from the 2nd and 1st centuries BC.
This new metal, which was easier to forge and more resistant, enabled a wider variety of metal objects and weapons to be produced.