The author, making use of his contributions to the subject, reflexes around the figure of the "Privados" and "Validos", and their transit to the figure of the Prime Minister. In this way, he passes through the mentioned institutions, from the XVI century until the beginning of the XIX century.El autor, valiéndose de sus aportes a la materia, reflexiona en torno a la figura de los Privados y Validos y su tránsito a la figura del Primer Ministro. Así, pasa revista a los cargos mencionados, desde el siglo XVI hasta principios del siglo XIX.