Disease Diplomacy: The Venetian Legacy Defining Modern Quarantine

By Aubrey Nelsen On May 2, 2026

Located in Northeast Italy, the Venetian Republic was a dominant maritime and economic powerhouse from 697 through 1797. Renowned as the “middleman” of the world, its position as an economic trading hub made it heavily reliant on Eastern resources. As a bridge between Europe and the East, the Republic pioneered practices that would later become central to modern capitalism. However, its role as an economic superpower was threatened when Europe came face-to-face with the bubonic plague, starting in 1347.

The Venetian Republic faced a dilemma: if it ceased all trade in an attempt to keep the plague from spreading through its ports, it might face economic demise, but if it did nothing, its fate might be even worse. Instead of stopping all trade, the Venetian Republic adopted isolation practices that soon came to be known as quarantine. Their newly created system was separated into two distinct islands: the Lazzaretto Nuovo and the Lazzaretto Vecchio. The former was focused on sanitary prevention, acting as a “filter” through which trading ships would be isolated before entering Venice. The latter was a hospital designated solely for those who were actively infected with the plague. Established in 1423, this new public infrastructure introduced new periods of waiting: Contumacy, the 40-day quarantine, and Purgation, the cleansing of goods and spices using salt water and vinegar. The Purgation process was particularly exhaustive. Clothing and textiles were vented for weeks on end, while more sensitive goods, such as silk and spices, were exposed to hot conditions to “purify” them.

This policy not only revolutionized health practices, but also bureaucracy when the Republic established the Provveditori alla Sanita, essentially a Health Magistracy. Formally implemented in 1490, it was the first government department to focus solely on public health, with supreme powers to override laws during outbreaks. Eventually, the Health Magistracy’s power became central to Venetian life. It had the ability to shut down taverns, restrict religious processions, and mandate that the dead be buried outside the city centre. This shift in governance favoured the collective community’s biological safety. This bureaucratic invention didn’t stop there; the Venetian Republic implemented the fede, known contemporarily as an international health passport. Coupled with border control, the fede allowed ships to enter Venice as long as they had documents verifying both their own health and the health of their port of origin. Without these papers, ships were automatically sent to the Lazzaretto for evaluation. These documents created a network of information sharing across the Mediterranean. In essence, it created the world’s first informal database for infectious diseases.

The Venetian Republic saw immense success with this system. In most European cities, the bubonic plague was devastating, wiping out half of their population. However, the Republic’s pragmatic response prevented the plague from devastating Venice, resulting in only two outbreaks in the 400 years the Lazaretti system operated. Ultimately, the Republic successfully created a system where both public safety and economic stability found a balance, demonstrating the vital role the state can play in health prevention and protection.

A contemporary image of a former Lazzaretto island in Malta. “Manoel Island Lazzaretto” by HH58 is licensed under CC BY 4.0.

Historically, this system has had a lasting influence, inspiring cities like Genoa and Marseille in the 15th century. More contemporarily, Ellis Island, though controversially, took inspiration from the Lazarettos, using similar quarantine procedures in the New York Harbour. With the modern revivals of these public health techniques, both domestically and internationally seen with the SARS and COVID-19 outbreaks, the practices of the Venetian Republic were clearly ahead of their time. Today, the standards and practices of contract tracing, border closures, and maritime quarantine show the enduring legacy of Venetian inventions centuries later. The Venetian legacy is a reminder that states can do more than provide medicine to society; they can build administrative architectures that allow globalized communities to continue to function in spite of inevitable biological crises.

Edited by Adele Torrington

Featured Image: A painting of the Venetian Republic on Ascension Day, a religious holiday, depicting a great boat procession and painted by Canaletto in the 1700s. “Ascension Day: The Embarkation of the Doge for the Marriage to the Sea Ceremony” by Alex David Baldi is licensed under CC BY 4.0.