Torcello, seven miles (11 km) to the north of the most serene city, was once a thriving place. Before the city of Venice ever rose from the waters, it was a great civic centre for the exiles from Venetia. They had first come in the middle of the fifth century. A cathedral of Byzantine form was raised here in the seventh century. It was built as a refuge and a strength by exiles fleeing from the mainland; the windows of the church have shutters of stone. Wealthy monasteries were founded on its fertile soil. In the tenth century it was described by the Emperor Constantine VII Porphyrogenitus as
On the majority of the islands could once be found a tall campanile and brick-built church; there was a small piazza, with the image of the lion on wall or pillar; there were little clusters of whitewashed houses, their gardens protected from the depredations of the salt wind by neat red fences. Then they were touched by decay more insidious than the wind. The island of Ammiana once boasted eight churches; then it was depopulated and turned into a salt farm. And where did the inhabitants go? They migrated to Venice. All of these dead towns and cities and settlements could once have been proposed as alternatives to Venice; they might have flourished and grown strong, as Venice did. If we were to follow the precepts of Italo Calvino’s
Other islands, once under Venetian control, have disappeared. The island of Constanziaca was engulfed by the waters. It had once contained monasteries and churches. It became so woeful, however, that it was turned into a burial site where the bones of the dead were left to bleach in the sun. Then with all its churches and bones it simply subsided into the sea. No one knows its precise position. Other islands suffered a similar fate, among them Terra dei Mani and Terra dei Soleri. Five little islands encircling Murano have been washed away by tides and currents. There is seaweed now where once tall cypresses grew. Some islands were overcome by earthquakes or tidal waves; others were claimed by a slow and general desuetude. They could not compete against the most serene city.
The Venetian authorities turned some of these once flourishing islands into prisons or hospitals. It was one way of pushing the undesirable elements of the population to the margins. It was also an exercise in total power. The island of S. Servolo was turned into a lunatic hospital for men, while the island of S. Clemente was a mental asylum for Venetian women. Sacca Sessola was a place of exile for those suffering from consumption, while the Isola della Grazia held those who burned with fever. On the island of Poveglia were laid out huts for the lepers banished from the city. All these islands were known to the Venetians as