structural:expansion, stylistic:style_transfer, linguistic:voice_change
Government: municipal councils and parliaments

As with all medieval kingdoms, supreme power was understood to reside in the monarch " by the grace of God ", as the legal formula explained. Nevertheless, rural and urban communities began to form assemblies to issue regulations to deal with everyday problems. Over time, these assemblies evolved into municipal councils, known as variously as ayuntamientos or cabildos, in which some of the inhabitants, the property-owning heads of households (vecinos), represented the rest. By the 14th century these councils had gained more powers, such as the right to elect municipal magistrates and officers (alcaldes, speakers, clerks, etc.) and representatives to the parliaments (Cortes).

Due to the increasing power of the municipal councils and the need for communication between these and the King, cortes were established in the Kingdom of León in 1188, and in Castile in 1250. Unlike other kingdoms, Castile didn't have a permanent capital (neither did Spain until the 16th century), so the cortes were celebrated in whichever city the king chose to stay. In the earliest Leonese and Castilian Cortes, the inhabitants of the cities (known as "laboratores") formed a small group of the representatives and had no legislative powers, but they were a link between the king and the general population, something that was pioneered by the kingdoms of Castile and León. Eventually the representatives of the cities gained the right to vote in the Cortes, often allying with the monarchs against the great noble lords.