"Los Jerónimos", as it was popularly known, was one of Madrid's most important convents. Beside it was the Cuarto Real, subsequently enlarged to become the Palacio del Buen Retiro in the time of Philip IV.
Of the convent, only the church, behind the Prado Museum, and a cloister remain today. The latter deteriorated badly during the nineteenth century and, following an agreement with the ecclesiastical authorities, it was restored and became part of the Prado Museum in the extension designed by architect Rafael Moneo. Because of its external appearance the cloister is known popularly as the "Moneo Cube".