The mural paintings that decorated the house known as “la Quinta del Sordo,” where Goya lived have come to be known as the Black Paintings, because he used so many dark pigments and blacks in them, and also because of their somber subject matter. The private and intimate character of that house allowed the artist to express himself with great liberty. He painted directly on the walls in what must have been mixed technique, as chemical analysis reveals the use of oils in these works.

The Baron Émile d'Erlanger acquired “la Quinta” in 1873 and had the paintings transferred to canvas. The works suffered enormously in the process, losing a large amount of paint. Finally, the Baron donated these paintings to the State, and they were sent to the Prado Museum, where they have been on view since 1889.

Brugada's title is a reference, in female genre, to the demon in the Old Testament's Book of Tobias, who is mentioned in El Diablo cojuelo — a seventeenth-century literary work by Vélez de Guevara— as a devil who shows the insides of houses.

Here, Goya uses the flying figures that began to appear repeatedly in his work in the seventeen-nineties, when he used them in his Caprichos to represent the most common deeds of witches. Here, the flying pair direct the viewer's gaze towards the fortress on the mountain. Two soldiers wearing French army uniforms aim their weapons at the background, where a procession advances on horseback.

Despite the multiple explanations offered by art historians, these works continue to be mysterious and enigmatic, yet they present many of the esthetic problems and moral considerations appearing in Goya's works.

The mural paintings from “la Quinta del Sordo” (the Black Paintings), have been determinant in the modern-day consideration of this painter from Aragon. The German Expressionists and the Surrealist movement, as well as representative of other contemporary artistic movements, including literature and even cinema, have seen the origins of modern art in this series of compositions by an aged Goya, isolated in his own world and creating with absolute liberty.