Spanish ship Monarca (1794)

She underwent proving trials between September and November 1794 alongside the Montañés, also launched in 1794 but designed by Julián Martín de Retamosa (Romero de Landa's successor), aiming to work out whose method of construction was best.

The trials were overseen by José Justo Salceno and the results favoured the Montañés.

The Monarca was assigned to Juan de Lángara's squadron, taking part in the defence of Roses.

She took part in the battle of Trafalgar on 21 October 1805 under the command of Captain Teodoro Argumosa y Bourke.

She was attacked at close range by HMS Mars and Tonnant as they first cut the Franco-Spanish line.

Plans for a ship of the San Ildefonsino class
In action at Trafalgar, HMS Tonnant engaging the Spanish 74-gun Monarca
Tonnant accepting Monarca ' s surrender, painted by Nicholas Pocock