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When a new doge was chosen, before he took the oath of investiture he was presented to the people with the formula "This is your doge, if it please you," preserving the constitutional fiction that the people of Venice ratified the selection. Yet in a real sense the doge was merely the highest servant of the greater community.

New regulations for the elections of the doge introduced in 1268 remained in force until the end of the republic in 1797. Their object was to minimize as far as possible the influence of individual great families, and this was effected by a complex elective machinery. Thirty members of the Great Council, chosen by lot, were reduced by lot to nine; the nine chose forty and the forty were reduced by lot to twelve, who chose twenty-five. The twenty-five were reduced by lot to nine and the nine elected forty-five. Then the forty-five were once more reduced by lot to eleven, and the eleven finally chose the forty-one who actually elected the doge.

During the 20th century, when many artesian wells were sunk into the periphery of the lagoon to draw water for local industry, Venice began to subside. It was realised that extraction of the aquifer was the cause. This sinking process has slowed markedly since artesian wells were banned in the 1960s. However, the city is still threatened by more frequent low-level floods (so-called Acqua alta, "high water") that creep to a height of several centimeters over its quays, regularly following certain tides. In many old houses the ground floor is unoccupied due to the periodic floods, but people continue to live and work in the upper stories.

The airport was named after the Venetian traveller Marco Polo, who supposedly re-discovered China for the Europeans

At the same time, however, the expansion of the Ottoman Turks in the Balkans and the Eastern Mediterranean proved threatening to the Venetians. In 1570, the Turks invaded Cyprus, which was conquered by 1571 despite the victory of the Holy League (including significant Venetian forces) at Lepanto later that year. The Venetians soon after made peace, confirming the loss of Cyprus. In the seventeenth century, Crete too was lost, after a long conflict.

Some recent studies have suggested that the city is no longer sinking, but this is not yet certain; therefore, a state of alert has not been revoked. In May 2003, Silvio Berlusconi, the Italian Prime Minister, inaugurated the "Moses" project, which will lay a series of 79 inflatable pontoons across the sea bed at the three entrances to the lagoon. When tides are predicted to rise above 110 centimetres, the pontoons will be filled with air and block the incoming water from the Adriatic sea. This challenging engineering work is due to be completed by 2011.

The city of Venice, previously a dependency of the Byzantine Empire, had established its independence of any eastern or western emperor as early as the ninth century. In the High Middle Ages, Venice became extremely wealthy through its control of trade to the Levant, and began to expand into the Adriatic Sea and beyond. The Venetian fleet was crucial to the sack of Constantinople by crusaders in the Fourth Crusade in 1204. As a result of the partition of the Byzantine Empire which followed, Venice gained a great deal of territory in the Aegean Sea, including the islands of Crete and Euboea. Later, in 1489, the island of Cyprus, previously a crusader state, was annexed to Venice.