Old Castle of Lieto

Old Castle of Lieto is a site of a hillfort in Lieto, Finland. It rises 55 meters above the sea level.The original name of the castle is not known. According to excavations, the castle has been in use three times during its history, in the Late Bronze Age and in Middle Iron Age. The third phase of the site between years 1000-1370 can be divided into two. According to the excavations the years 1000–1150 are marked with German money and prehistoric artefacts and the years 1200–1370 with Scandinavian bracteates and medieval artefacts. The hillfort was used by the local Finns proper population until 1170, when it was conquered most likely by the Swedes who possibly used it as a stronghold against Tavastians.

The steep hillside supported by fortifications on top of the hill provided a good defensive position. Constructions on the hillfort were mostly made of wood.