THE SHIPS FROM THE GIUDICATO 
In the XIII century, the Roman ships were covered by silt consisting of pieces of broken stone, mostly deriving from Roman ruins as witnessed by column fragments, and reinforced with posts.
In this way, the shoreline was moved forward to go beyond the part rendered unfit for use by the Roman ships and reach deeper, unencumbered water.
Five wrecks have been found in this silt; smaller as compared to the Roman ones, they were already old vessels when they sank.
Of these ships from the Giudicato period, one sank following a fire, two were abandoned and two were used to cover the silt.
One of the ships utilized is remarkable: without a keel, it was 12 m long and 2.5 m wide and was thus very fast; it is extremely valuable in reconstructing the naval techniques of that time.
Among the countless finds relative to the medieval period, we note the Pisan and Ligurian goblets, Sicilian pottery, glass chalices and goblets and articles from Moslem cultures, testifying to the fact that Olbia was a thriving city.
