In the summer of 1380, starving Genoese troops in the Chioggia lagoon surrendered to the Venetians—but peace was still a year away, and an understanding of what exactly had happened, centuries.
Venice in the 14th century was a paradox frozen in stone and water. Tens of thousands of people lived on islands where it was impossible to grow a single ear of wheat. Everything on a Venetian’s table—bread, meat, vegetables—arrived by sea or through canals from the mainland. Around a third of its grain came from Crete, the rest from the Black Sea region, Byzantium, and territories controlled by the Turks. A disruption in supplies—and the city began to starve not in a month, but in a week. This is no figure of speech: Venice had no agricultural hinterland, no granaries sunk into rich flatland soil. Its granary was the sea, and the key to it was the fleet.
The second pillar was Adriatic salt. Its role is easy to underestimate if you think of salt as a seasoning. In the 14th century, salt was a refrigerator. The only reliable way to preserve fish, meat, and cheese for weeks and months. Salt was a food-preserving commodity, a source of tax revenue, an export good and, less obviously, ballast for merchant ships: vessels sailing empty to collect cargo in the east carried salt in their holds so they would not pitch about on the waves, and sold it along the way. Roughly speaking, salt made economically possible the very voyage that would later bring back spices, silk, and cotton.
Spices—yes, of course, pepper, cinnamon, cloves—were the cherry on top of this cake, the most profitable part of the trade. But the foundation rested on grain and salt. Without them, there would have been nobody to buy spices, because the customers would have been lying there starving.
Chioggia is a small town in the southern part of the Venetian Lagoon, and its strategic importance is easiest to explain through geography. The lagoon is not open sea; it is a shallow expanse separated from the Adriatic by strips of islands, with narrow passages between them. Chioggia controlled the southern approaches to Venice: the navigable channels used by ships carrying grain and salt. It was also home to saltworks and fisheries—that is, both the raw material and the route by which it was delivered.
What gets me is how precisely the Genoese chose their target. To seize Chioggia meant not merely to approach Venice, but to cut off its oxygen. A city that eats from the water can be killed by severing its waterways. Genoa knew this because it was much the same itself: a maritime republic dependent on the sea. The difference was that Genoa stood on the coast, while Venice stood in the middle of a lagoon—and that made it both more impregnable and more vulnerable.
The conflict of 1378–1381 grew out of decades of commercial rivalry over routes in the Eastern Mediterranean. The point where it crystallized was the island of Tenedos—a scrap of land at the entrance to the Dardanelles, controlling the route into the Black Sea. Both republics laid claim to it; both understood that whoever held Tenedos had a hand on the throat of Black Sea trade. The war began on distant sea routes, but struck at the very heart.
On 16 August 1379, the Genoese fleet captured Chioggia. The Genoese acted as part of a coalition: they were backed by Hungary, ruled by King Louis I, and Padua, under Francesco I da Carrara. This was not a naval duel between two republics, but coordinated pressure from sea and land. Hungary held Dalmatia—the eastern Adriatic coast that Venice had ceded under the Peace of Zadar in 1358, though it had never accepted the loss. Padua, its nearest neighbor on land, had grievances of its own against the Republic of Saint Mark. Venice found itself encircled.
The situation after the fall of Chioggia was catastrophic. The Genoese stood in the lagoon—only a few hours’ sail from Venice itself. They blocked the approaches through which food arrived. The republic, accustomed to fighting on foreign shores, for the first time in a long while felt war on its own doorstep. The Venetian fleet was scattered: some of its ships, commanded by Carlo Zeno, were far away in the Levant, preying on Genoese trade. The forces that remained were barely enough for defense.
The city reacted as an organism reacts to a mortal threat—by mobilizing everything. The Senate declared emergency loans. Wealthy families put up money in return for promises of future privileges. The Arsenal—the famed Venetian shipyard, capable of assembling galleys at something like assembly-line speed—worked without pause. Everything that could stay afloat was armed. Doge Andrea Contarini, nearly eighty years old, personally took charge of the war effort. This was no ceremonial role: the old man truly coordinated the defense of a city balancing between starvation and capitulation.
The decision the Venetians made was audacious to the point of madness. Instead of trying to drive the Genoese out of Chioggia with a frontal assault—there were not enough forces for that—they decided to lock them inside. To turn the conquerors into prisoners.
On the night of 22 December 1379, Doge Contarini and Admiral Vettor Pisani led the fleet toward Chioggia. The plan was to sink ships loaded with stones in the narrow channels leading from the town into the open lagoon. The channels in this part of the lagoon were not broad sea straits but winding fairways through shallow water; it was physically possible to block them, if there was enough resolve to sacrifice ships. There was enough resolve. The Venetians sealed off the exits, and the Genoese garrison, which had only just considered itself the besieging force, found that it was trapped.
It was a tactical reversal, but not yet a victory. The Genoese in Chioggia remained battle-ready; they had fortifications and supplies—for a while. The Venetians would have to maintain the blockade for months while supplying their own hungry city. Every day of the blockade cost money, ships, lives. The ring around Chioggia was fragile: if the Genoese fleet from the homeland had arrived and broken through, the trap would have snapped shut on the Venetians themselves.
And then came what Venetian historiography would later paint in almost mythical tones. On 1 January 1380, the fleet of Carlo Zeno, returning from the Levant, joined the besiegers. For months, Zeno had been plundering Genoese merchant vessels in the Eastern Mediterranean—and now he brought his ships home, at the very moment they were needed most. The blockade ring tightened. The Genoese garrison’s chances of rescue began to melt away like salt in rainwater.
The siege lasted half a year—from late December to late June. The Genoese in Chioggia waited for help. Genoa outfitted reinforcements: on 12 May 1380, a squadron under the command of Matteo Maruffo tried to break the blockade. The attempt failed. The Venetians held their positions, and that was a sentence on the besieged—not a legal one, but a biological one. Food was running out.
The irony was brutal. Chioggia—a town of fishermen and saltworkers, a place where food and the means of preserving it were produced—became a place where people died of hunger. The Genoese garrison, having seized a strategic hub in Venice’s food infrastructure, was itself cut off from food. The machinery of war aimed at Venetian supply lines turned and struck those who had set it in motion.
On 24 June 1380, the garrison capitulated. Thousands of Genoese soldiers and sailors were taken prisoner. For Venice, it was a moment of immense relief—but by no means the end of the war. Genoa as a state had not been crushed: its fleet still existed, its merchant houses still operated, its bankers still lent to half of Europe. The capitulation of Chioggia was the defeat of an expeditionary corps, not the collapse of a power.
The war dragged on for more than another year after the fall of Chioggia—listless clashes, diplomatic maneuvers, mutual exhaustion. The mediator was Amadeus VI of Savoy, known as the “Green Count” (the nickname apparently tied to his fondness for the color green at tournaments). On 8 August 1381, a peace treaty was signed in Turin, and its terms deserve a close reading.
Venice, the formal victor at Chioggia, paid dearly for peace. The island of Tenedos—the very place over which, essentially, it had all begun—went to no one: it was handed over to Savoy on condition that its fortifications be demolished. Venice recognized Hungary’s sovereignty over Dalmatia—a coast it had controlled for decades—and undertook to pay the Hungarian crown 7,000 ducats annually. The republic also ceased trading in Tana—a key port on the Sea of Azov, gateway to Black Sea commerce—for two years. For a state whose economy was built on the transit of eastern goods, a two-year ban on trade at one of its main entrepôts was a palpable blow.
It seems to me that this is where the war’s real meaning comes into view. The victor emerged weakened. The loser—battered, but not destroyed. Genoa retained enormous weight in Mediterranean trade and finance for centuries after Chioggia: Genoese bankers would lend to the Spanish crown, Genoese merchants would trade in the Levant, a Genoese sailor would discover America. The War of Chioggia was not Genoa’s end—it was a demonstration of the point beyond which commercial rivalry devours both rivals.
Both republics drove their competition to the point where physical survival was at stake—and both nearly lost. Venice nearly lost access to its own food supply. Genoa lost an expeditionary army in a foreign lagoon. Salt, which preserved food and paid for voyages. Grain, which came by sea because there was no other way. Canals that could be blocked with sunken stone-laden barges. None of this was romantic scenery, but the engineering blueprint of a medieval city-state, and the war of 1378–1381 tested that blueprint to its limits, nearly breaking it.
After the Peace of Turin, Venice gradually restored its position in the Eastern Mediterranean. It learned its lessons: it fortified the lagoon, reformed its emergency financing system, and bound grain routes to itself even more tightly. Genoa took another path—ever deeper into finance, banking, and lending to other people’s empires. The two republics, exhausted by their shared war, went their separate ways down different corridors of history, yet neither forgot how easily one could sever the supply lines of a city fed by the sea. A century and a half after Chioggia, that lesson would become urgent again—when the Ottomans began methodically cutting Venice off from eastern markets, and this time no sunken barges would help.