At the end of the Middle Ages, there are many examples of minor literary texts, with administrative, political or protocol content and purposes, within the new bureaucracy that was consolidated in the Iberian Peninsula during the reign of Isabel I de Castilla and her husband Fernando II of Aragon. Administrative models of the so-called gray literature and rhetorical genres were not only samples of the survival of a curial culture, or of socio-literary ephemera, but also instruments of State officials, at the service of the Crown, and of their textual practices. This article pays attention to one of those samples that, while still being the result of traditional rhetorical models, testifies to the possible emergence of some essential political concept in the renewal of the monarchy during the Modern Age