Located outside the city walls but very close to the historic centre, the Convent of the Mercedarias stands opposite the Mazarelos arch and occupies a large plot of land in the centre of the city. It is a modest building, built during the archbishopric of Girón by Diego de Romay at the beginning of the 17th century in the Baroque style.

The nuns who live in this convent belong to the Madres Mercedarias Descalzas, an order that takes votes of cloister and whose spirit justifies the simplicity of the architectural ensemble, which is only broken in a very slight way if we stop to observe the decoration that runs along the façade of the church or the giant Corinthian pilasters, which interrupt the horizontality together with the bell tower, erected in the 18th century.

The convent church houses the Annunciation, a figure carved by Mateo de Prado in 1674, and an image of Our Lady of Mercy, by the artist José Ferreiro.

On the smooth walls of the façade, there is a projecting window which stands out as it is framed by louvres at the four corners, as well as a cornice with gargoyles and corbelled brackets.