This collection of studies presents the results of research to discover the scope of aristocratic ambitions of the urban elites in the Hispanic kingdoms in the Late Middle Ages. The goal is to gain a greater knowledge of the urban elites in order to discover the social and political motivations of the privileged, those who were able to profit from the mechanisms of social ascension. Aristocratisation is also related to the adoption of values which determined the behavior and mentality under the mark of the dominant feudal culture. The strategies, the resources to move up the social ladder and the ambition of the urban social elite and the occasions used to ensure successful promotion and the results obtained should be brought to light. The variety in the urban elites within the Iberian Peninsula offers comparative possibilities and supposes an important advancement in the knowledge of aspects related to social promotion.