Four brutal naval wars defined the struggle for Mediterranean dominance between Venice and Genoa.
Between 1256 and 1381, the maritime republics of Venice and Genoa fought four major wars for control of Mediterranean trade routes. These conflicts, characterized by naval clashes and a persistent cold war, ultimately reshaped the political landscape of Europe and contributed to the spread of the Black Death.
The rivalry between Venice and Genoa emerged as both cities established thalassocracies—maritime empires—following the economic recovery of Europe in the 11th century. Their competition intensified after the Fourth Crusade in 1204, which granted Venice significant influence over Byzantine territories. The first major conflict, the War of Saint Sabas (1256–1270), was triggered by disputes in Acre, though it failed to curb Genoese expansion into the Black Sea, which was formalized by the 1261 Treaty of Nymphaeum.
Subsequent wars, including the War of the Straits (1350–1355) and the War of Chioggia (1377–1381), saw shifting alliances involving the Byzantine Empire, the Crown of Aragon, and various Italian powers. During the siege of Caffa in 1346, the Mongol forces reportedly utilized biological warfare by launching plague-ridden corpses into the city. This event is believed to have facilitated the spread of the Black Death, as merchant ships fleeing the region carried infected rats into the Mediterranean.
By the 15th century, the intensity of the Venetian-Genoese conflict waned. Both republics faced mounting pressures from external powers, such as the Ottoman Empire for Venice and the Kingdom of Aragon for Genoa. Furthermore, the shifting of global trade routes during the Age of Discovery diminished the strategic importance of the Mediterranean. While sporadic naval skirmishes continued until 1431, the two cities eventually moved toward collaboration, most notably against the Ottoman threat, marking the end of their era as primary antagonists.
Source: Venetian–Genoese Wars
