Itanos was particularly powerful community during the Greek era and it was flourishing by the seventh century BC. Itanos was continuously at war with its neighbours Praisos, and later Hierapytna.
In the 8th century AD Itanos was destroyed in an earthquake but the inhabitants stayed and rebuilt the town. Only in the 15th century after attacks by pirates the town was finally destroyed and deserted. Because the west of Crete slowly elevates upwards and the east odf the island is slowly sinking (6 to 9 meters in the last 2000 years, mainly caused by earthquakes) parts of the harbour of Itanos have now sunk into the sea.
Herodotos was the first Greek historian who mentioned Itanos. The archeological site of Itanos is open to the public. It is possible to see the ruins of houses, city walls and Christian churches. Many Greek inscriptions were found in situ; the most famous one, kept now in the monastery of Toplou, relates a decision by the Roman Senate about Itanos' conflicts and territorial disputes with the neighbor cities Praisos and Hierapytna.
Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.