The Siete Partidas or simply Partidas, was a Castilian statutory code first compiled during the reign of Alfonso X of Castile (1252–1284), with the intent of establishing a uniform body of normative rules for the kingdom. The codified and compiled text was originally called the Libro de las Leyes. It was not until the 14th century that it was given its present name, referring to the number of sections into which it is divided.

The Crown of Castile was a medieval polity in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and, some decades later, the parliaments of the kingdoms of Castile and León upon the accession of the then Castilian king, Ferdinand III, to the vacant Leonese throne. It continued to exist as a separate entity after the personal union in 1469 of the crowns of Castile and Aragon with the marriage of the Catholic Monarchs up to the promulgation of the Nueva Planta decrees by Philip V in 1715.