HMS Seahorse was a 24-gun sixth-rate frigate of the Royal Navy, launched in 1748. She is perhaps most famous as the ship on which a young Horatio Nelson served as a midshipman. She also participated in four battles off the coast of India between 1781 and 1783. The Royal Navy sold her in 1784 and she then became the mercantile Ravensworth. She made one voyage for the British East India Company (EIC) between 1786 and 1788. In 1789, she was sold to the French East India Company which had her refitted and renamed her Citoyen. In 1793 the French Navy purchased her and used her as a frigate. She was last listed in 1801.

Vice-Admiral Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronte was a British flag officer in the Royal Navy. His inspirational leadership, grasp of strategy and unconventional tactics brought about a number of decisive British naval victories during the French Revolutionary and Napoleonic Wars. He is widely regarded as one of the greatest naval commanders in history. His victory on 21 October 1805 at the Battle of Trafalgar led to British naval supremacy for over another century and beyond.