Mesta

thumb|200px|right|The principal drove roads of Spain The Mesta () was a powerful association protecting livestock owners and their animals in the Crown of Castile that was incorporated in the 13th century and was dissolved in 1836. Although best known for its organisation of the annual migration of transhumant sheep, particularly those of the Merino breed, the flocks and herds of all species of livestock in Castile and their owners were under the oversight of the Mesta, including both the transhumant and the sedentary ones. The transhumant sheep were generally owned in Old Castile and León, where they had their summer pastures, and they migrated to and from winter pastures of Extremadura and Andalusia according to the season.

The royal protection for the Mesta's flocks and herds was signified by the term Cabaña Real ( that applied to these protected animals. The kings of Castile conceded many other privileges to the Mesta. The cañadas (traditional rights-of-way for sheep or sheep-walks) were legally protected in perpetuity from being built on, cultivated or blocked, and they still are protected public domain in our days. The most important cañadas were called , because they were established by royal decrees.