Communications Texts defended at the 15th Scientific Meeting of the Spanish Foundation of Modern History, following a peer review. The aim of this work is to analyse the role of traditional nobility and aristocracy in the administration of the Hispanic Monarchy during the Modern Age. In this regard, it will seek to study the evolution of their presence in the highest state institutions and the social extraction of the groups present in these institutions. In addition to the diachronical vision, this study focuses on the 18th century to try to measure the extent to which aristocratic groups were relegated by the Borbones of the Monarchy Government and to define the areas of power in which they were located, since this removal from power centres took place. This research is part of the Research Project ‘Societal transformations of change. New solidarity and breakdown of hierarchies (18-XX centuries)’ (HAR2017-84226-C6-1-P), which was funded by the Ministry of Economy, Industry and Competitiveness under the State Programme for the Promotion of Scientific and Technical Research of Excellence (State sub-programme for knowledge generation).