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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.

In Venice the office of doge was first instituted about 700, replacing tribunes that had led the cluster of early settlements in the lagoon, according to the chronicler John the Deacon, author of the Chronicon Venetum ("Chronicle of Venice"), written about 1000 CE. Whether or not the first doges were technically local representatives of the Emperor at Constantinople, the doge like the Emperor held office for life and was similarly regarded as the ecclesiastical, the civil and the military leader, in the power structure termed caesaropapism. The doge's prerogatives were not defined with precision, and though the position was entrusted to members of the inner circle of powerful Venetian families, after several doges had associated a son with themselves in the ducal office, this tendency towards a hereditary monarchy was checked by a law which decreed that no doge had the right to associate any member of his family with himself in his office, or to name his successor. After 1172 the election of the doge was finally entrusted to a committee of forty, who were chosen by four men selected from the Great Council, which was itself nominated annually by twelve persons. After a deadlocked tie at the election of 1229, the number of electors was increased from forty to forty-one.

Its banks are lined with some of the most beautiful buildings of the city, amongst the many palazzos and churches are the Ca' Rezzonico, Ca d'Oro, Ca' Foscari, Palazzo Barbarigo and the Palazzo Venier dei Leoni, housing the Peggy Guggenheim Collection

The buildings of Venice are constructed on closely spaced wood piles (under water, in the absence of oxygen, wood does not decay) which penetrate alternating layers of clay and sand. Most of these piles are still intact after centuries of submersion. The foundations rest on the piles, and buildings of brick or stone sit above these footings. The buildings are often threatened by flood tides pushing in from the Adriatic between autumn and early spring.

The city was founded as a result of the influx of refugees into the marshes of the Po estuary following the invasion of northern Italy by the Lombards in 568. In the mid-8th century, the Venetians resisted the empire-building efforts of Pepin III and remained subject to the Byzantine Empire, at least theoretically. As the community continued to develop and as Byzantine power waned, however, an increasingly anti-Eastern character emerged, leading to the growth of autonomy and eventual independence. Venice was a city state (an Italian thalassocracy or Repubblica Marinara, the other three being Genoa, Pisa, and Amalfi). Its strategic position at head of the Adriatic made Venetian naval and commercial power almost invulnerable.

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

Venetian ambassadors sent home still-extant secret reports of the politics and rumours of European courts, providing fascinating information to modern historians.