From Imperial Spain: 1469-1716, by J. H. Elliott (Penguin, 2002), 2nd ed., Kindle Loc. 2181-2234:
The reign of Ferdinand and Isabella was called by Prescott ‘the most glorious epoch in the annals’ of Spain. Generations of Spaniards, contrasting their own times with those of the Catholic Kings, would look back upon them as the golden age of Castile. The conquest of Granada, the discovery of America, and the triumphant emergence of Spain on to the European political stage lent unparalleled lustre to the new State created by the Union of the Crowns, and set the seal of success on the political, religious, and economic reforms of the royal couple.
Against the conventional picture of a glorious spring-time under Ferdinand and Isabella, too soon to be turned to winter by the folly of their successors, there must, however, be set some of the less happy features of their reign. They had united two Crowns, but had not even tentatively embarked on the much more arduous task of uniting two peoples. They had destroyed the political power of the great nobility, but left its economic and social influence untouched. They had reorganized the Castilian economy, but at the price of reinforcing the system of latifundios and the predominance of grazing over tillage. They had introduced into Castile certain Aragonese economic institutions, monopolistic in spirit, while failing to bring the Castilian and Aragonese economies any closer together. They had restored order in Castile, but in the process had overthrown the fragile barriers that stood in the way of absolutism. They had reformed the Church, but set up the Inquisition. And they had expelled one of the most dynamic and resourceful sections of the community – the Jews. All this must darken a picture that is often painted excessively bright.
Yet nothing can alter the fact that Ferdinand and Isabella created Spain; that in their reign it acquired both an international existence and – under the impulse given by the creative exuberance of the Castilians and the organizing capacity of the Aragonese – the beginnings of a corporate identity. Out of their long experience, the Aragonese could provide the administrative methods which would give the new monarchy an institutional form. The Castilians, for their part, were to provide the dynamism which would impel the new State forward; and it was this dynamism which gave the Spain of Ferdinand and Isabella its distinguishing character. The Spain of the Catholic Kings is essentially Castile: a Castile, overflowing with creative energy, which seemed suddenly to have discovered itself.
The Court was the natural center of Castile’s cultural life; and since Spain still had no fixed capital it was a Court on the move, bringing new ideas and influences from one town to another as it travelled round the country. Since Isabella enjoyed a European reputation for her patronage of learning, she was able to attract to the Court distinguished foreign scholars like the Milanese Pietro Martire, the director of the palace school. Frequented by foreign scholars and by Spaniards who had returned from studying in Italy, the Court thus became an outpost of the new humanism, which was now beginning to establish itself in Spain.
One of the devotees of the new learning was Elio Antonio de Nebrija (1444–1522), who returned home from Italy in 1473 – the year in which printing was introduced into Spain. Nebrija, who held the post of historiographer royal, was a grammarian and lexicographer, and an editor of classical texts in the best humanist tradition. But his interests, like those of many humanists, extended also to the vernacular, and he published in 1492 a Castilian grammar – the first grammar to be compiled of a modern European language. ‘What is it for?’ asked Isabella when it was presented to her. ‘Your Majesty,’ replied the Bishop of Avila on Nebrija’s behalf, ‘language is the perfect instrument of empire.’
The Bishop’s reply was prophetic. One of the secrets of Castilian domination of the Spanish Monarchy in the sixteenth century was to be found in the triumph of its language and culture over that of other parts of the peninsula and empire. The cultural and linguistic success of the Castilians was no doubt facilitated by the decline of Catalan culture in the sixteenth century, as it was also facilitated by the advantageous position of Castilian as the language of Court and bureaucracy. But, in the last analysis, Castile’s cultural predominance derived from the innate vitality of its literature and language at the end of the fifteenth century. The language of the greatest work produced in the Castile of the Catholic Kings, the Celestina of the converso Fernando de Rojas, is at once vigorous, flexible, and authoritative: a language that was indeed ‘the perfect instrument of empire’.