Completar frases LA MESTAVersión en línea Complete the gaps of the following text using specific vocabulary. Text about la Mesta, merino sheep wool trade in Castile during medieval ages. por Alfonso Poza 1 Castile pastures union nobility wool 13th markets privileges grazing arable sheep The Mesta was a powerful association of ranchers in the medieval Crown of . The sheep were transhumant , migrating from the of Extremadura and Andalusia to León and Castile and back according to the season . The no - man's - land between the Christian - controlled north and Moorish - controlled south was too insecure for farming and was only exploited by shepherds . When the Christians conquered the south , farmers began to settle in the lands , and disputes with pastoralists were common . The Mesta , set up in the late century , [ 1 ] can be regarded as the first , and most powerful , agricultural in medieval Europe . The export of merino enriched the members of the Mesta ( the and religious orders ) . Two of the most important wool were held in Medina del Campo and Burgos . The kings of Castile conceded many to the Mesta .