HMS Leviathan was a 74-gun third-rate

Third-rate

In the British Royal Navy, a third rate was a ship of the line which from the 1720s mounted between 64 and 80 guns, typically built with two gun decks . Years of experience proved that the third rate ships embodied the best compromise between sailing ability , firepower, and cost...

 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 Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

, launched on 9 October 1790. At the Battle of Trafalgar

Battle of Trafalgar

The Battle of Trafalgar was a sea battle fought between the British Royal Navy and the combined fleets of the French Navy and Spanish Navy, during the War of the Third Coalition of the Napoleonic Wars ....

 under Henry William Bayntun

Henry William Bayntun

Admiral Sir Henry William Bayntun GCB was a senior officer in the Royal Navy, whose distinguished career in the French Revolutionary and Napoleonic Wars was a catalogue of the highest and lowest points of the Navy during the conflict...

, she was near the front of the windward column led by Admiral Lord Nelson aboard his flagship, , and captured the Spanish ship San Augustin.

In 1816, after the end of the Napoleonic Wars

Napoleonic Wars

The Napoleonic Wars were a series of wars declared against Napoleon's French Empire by opposing coalitions that ran from 1803 to 1815. As a continuation of the wars sparked by the French Revolution of 1789, they revolutionised European armies and played out on an unprecedented scale, mainly due to...

, she was converted into a prison ship

Prison ship

A prison ship, historically sometimes called a prison hulk, is a vessel used as a prison, often to hold convicts awaiting transportation to penal colonies. This practice was popular with the British government in the 18th and 19th centuries....

and in 1848 was sold and broken up.