Compléter Crown of CastileVersion en ligne The Crown of Castile was a medieval state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the kingdoms of Castile and León par Maru Cruz 1 law 1230 Cortes king stockbreeding Ferdinand Mesta Merino assemblie institutions wool trade craftsmanship The Crown of Castile was founded by III in , when he united the kingdoms of Castile and León . The Crown of Castile was a unified state , with the same and the same for the whole of its territory . The had great power , and the Castilian could not legislate . The economy was based on agriculture and . sheep were very important because of their high quality . In the 13th century the Honourable Council of the was created , a sheep breeders to grant privileges . The sale of wool contributed to the development of and .