The Biblioteca Estense (Estense Library), was the family library of the marquises and dukes of the House of Este. The exact date of the library's birth is still under speculation, however it is known for certain that the library was in use during the fourteenth century.[1] Whilst it was greatly enriched during the Renaissance years in Ferrara, the library was concretely established in Modena in the beginning of the seventeenth century. It is known as one of the most important libraries in Italy.[1] The library is located, along with the Galleria Estense directly below its collection of artworks, in the Palazzo dei Musei (Piazza Sant'Agostino 337) in Modena.