From the Greek poets to the great religious works, such as Mystica Ciudad de Dios, the bedside book of the Santo Arcediago, from the classical architecture seen by Piranesi to António Franco's Promptuario de syntaxe, belonging to D. Leonor de Portugal, the more than six thousand titles that make up its bibliographical collection reveal the family's relationship with the university and ecclesiastical milieus, the two great sources of knowledge at the time.