El Buscon is a work that reflects the feudal crisis and the rise of the mercantile society. This metamorphosis is considered by the author of the work as a carnavalizacion of society which must obligatorily be represented in a satirical manner.Francisco de Quevedo belonged to an aristocratic family that had stood since early times by the defense of the Christian identity of Spain. It is important to remember that throughout the middle ages and the modern age part existed in Spain the cristiano-espanol Association by which Jews and Muslims were considered foreign. The author of the Buscon belongs to a social group that clings to the Spanish estates, i.e. who considers that social condition is extremely related features granted by blood.The sectarian mentality of Quevedo sees some facts that occur in the 17TH century with bad eyes. The approach of the Portuguese bourgeoisie of convert source to the Crown Spanish in the period of Felipe III and Felipe IV is considered - according to don Francisco - a serious risk for estates structure which had been guaranteed by several years the privileged position of his family and himself. Other facts that concern to the author of the Buscon were the constant purchase of enforceable of nobility of some converts belonging to the bourgeoisie and admission to universities, clergy and orders of chivalry in people who possessed the macula's blood.In the Buscon we find a direct criticism of the intrusion of converts in the Affairs of the Crown, characters like the arbitrary, the fencing master, the soldier show that blood cleaning statutes have been ignored, allowing those who do not possess the blood requirements to pass to form part of orders that were previously assigned to the clean nobility enforceable counterfeiting is alluded to through the Coronel family, which directly recalls the Rabbi of Segovia Abraham Senior, friend of Isabel the Catholic, who suggested that he became to Catholicism after the Decree of expulsion of the Jews.