The radiography of Goya’s first portrait of Gaspar Melchor de Jovellanos has revealed the existence of a subjacent composition where a young woman is represented. During the first stage of the study of this document, the correspondence of the pictorial features of both portraits was verified and the possibility of both of them being painted by the Aragonese painter was established. In the same way, some characteristics in the attire and position of the woman were observed and showed she belonged to nobility. This set the date of creation of this painting between 1782 and 1785. However, the identity of this woman was impossible to determine, so the line of investigation followed has been conditioned, and this is what is reasoned in this article.