Following notes are the result of an already long teaching expierience in the bilingual programms in which students belonging to Human Sciences needed to study certain aspects of Spanish history in English having the lack of a synthetic publication to keep up the classes. Here we have gathered the basic contents of the Spanish public institutions in order to acheive a basic knowledge throughout history. These notes are fundamentally thought for students therefore the contents are very basic and synthesized. Following pages have an intelectual debt with the authors of two Spanish reference manuals in the current subject: José Antonio Escudero, Curso de Historia del Derecho, Fuentes e Instituciones Político-administrativas, Madrid, 2003 y Bruno Aguilera Barchet, Historia y Derecho, Barcelona, 1999. From both prestigious authors come all the texts, main ideas, great part of the structure used and surely the most valuable aspects of following pages. Our role in this work has been esential and activity of translating and synthezising their manual.