The San Zaccharia was a 64-gun ship of the line

Ship of the line

A ship of the line was a type of naval warship constructed from the 17th through the mid-19th century to take part in the naval tactic known as the line of battle, in which two columns of opposing warships would manoeuvre to bring the greatest weight of broadside guns to bear...

 of the Navy of the Knights of St John of Malta

Malta

Malta , officially known as the Republic of Malta , is a Southern European country consisting of an archipelago situated in the centre of the Mediterranean, south of Sicily, east of Tunisia and north of Libya, with Gibraltar to the west and Alexandria to the east.Malta covers just over in...

, later brought into French service as the Dégo.

Construction of San Zaccharia began in 1763 at Senglea Dockyard

Senglea

Senglea is a fortified city in the east of Malta, mainly in the Grand Harbour area. It is one of the Three Cities in the east of Malta, the other two being Cospicua and Vittoriosa. The city of Senglea is also called Civitas Invicta, because it managed to resist the Ottoman invasion at the Great...

, Malta

Malta

Malta , officially known as the Republic of Malta , is a Southern European country consisting of an archipelago situated in the centre of the Mediterranean, south of Sicily, east of Tunisia and north of Libya, with Gibraltar to the west and Alexandria to the east.Malta covers just over in...

 under the supervision of Master Shipwrights Agostino and Giuseppe Scolaro. She was launched two years later on 7 March 1765 and had been completed by 21 July 1765. She served with the Maltese Navy until the French invaded Malta on 11 June 1798, as part of the Mediterranean campaign of 1798

Mediterranean campaign of 1798

The Mediterranean campaign of 1798 was a series of major naval operations surrounding a French expeditionary force sent to Egypt under Napoleon Bonaparte during the French Revolutionary Wars. The French Republic sought to capture Egypt as the first stage in an effort to threaten British India, and...

. Her name was first gallicised into Zacharie, but she was promptly renamed Dégo upon request by Napoleon Bonaparte.

Dégo was blockaded in Valletta harbour

Grand Harbour

Grand Harbour is a natural harbour on the island of Malta. It has been used as a harbour since at least Phoenician times...

 during the Siege of Malta

Siege of Malta (1798–1800)

The Siege of Malta was a two-year siege and blockade of the French garrison in Valletta, the largest city and main port on the Mediterranean island of Malta between 1798 and 1800. Valletta had been captured by a French expeditionary force during the Mediterranean campaign of 1798, and garrisoned...

 by the British, and was used as a prison hulk in Valletta harbour, being steadily stripped for firewood. She was eventually captured when the island surrendered on 4 September 1800, but the British considered her too worn out to take into service. She probably continued in use as a prison hulk, until she was sold for breaking up in 1803.