Prehistory
The first evidence for human activity in the area of Eretria are pottery shards and stone artefacts from the late Neolithic period (3500-3000 BC) found on the acropolis as well as in the plain. No permanent structures have yet been found. It is therefore unclear whether a permanent settlement existed at that time.
The first known settlement from the Early Helladic period (3000-2000 BC) was located in the plain. A granary and several other buildings as well as a pottery kiln have been found so far. This settlement was moved to the top of the Acropolis in the Middle Helladic period (2000-1600 BC), because the plain was flooded by the nearby lagoon. In the Late Helladic period (1600-1100 BC), the population dwindled and the remains found so far have been interpreted as an observation post. The site was abandoned during the Dark Ages.