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The Monarca was a 74-gun third-rate ship of the line of the Spanish Navy. She was ordered by a royal order of 28 September 1791, built in the Reales Astilleros de Esteiro shipyard and launched on 17 March 1794. Designed by José Romero Fernández de Landa and belonging to the San Ildefonso class, her main guns were distributed along two complete decks, with twenty-eight 24-pounders in her first battery (lower deck) and thirty 18-pounders in her second battery (upper deck). Additionally on completion she had ten 8-pounders on her quarterdeck and six 8-pounders on her forecastle, although these guns were altered during her life.