The Fuero Real was undoubtedly his work, and he began the code called the Siete Partidas, which, however, was only promulgated by his great-grandson.
FUERO, a Spanish term, derived from the Latin forum.
The earliest extant written fuero is probably that which was granted to the province and town of Leon by Alphonso V.
The "fuero general" does not profess to supersede the consuetudines antiquorum jurium or Chindaswint's codification of these in the Lex Visigothorum; the "fuero municipal" is really for the most part but a resuscitation of usages formerly established, a recognition and definition of liberties and privileges that had long before been conceded or taken for granted.
Almost contemporaneous with this fuero of Leon was that granted to Najera (Naxera) by Sancho el Mayor of Navarre (ob.