What was the linguistic policy of King Ferdinand II of Aragon (and by extension, his Trastamara predecessors in Aragon)?
Obviously the various regions of the Spanish kingdoms maintained their own languages and institutions. However, I'm curious as to if Castilian Spanish was promoted by the Catholic kings throughout their many realms (such as at the royal court and in the administration), especially considering the Castilian origin of the Trastamara kings of Aragon.