But towards the close of the fifteenth century the dawn of a new literary era appeared, which soon shone with meridian light. At this time, the universities had become more and more the subjects of attention to the governments; the appointment of eminent professors, and the privileges connected with these institutions, attracted to them large numbers of students, and the concourse was often so great that the lectures were delivered in the churches and in public squares. Those republics which still existed, and the princes who had risen on the ruins of the more ephemeral ones, rivaled each other in their patronage of literary men; the popes, who in the preceding ages had denounced all secular learning, now became its munificent patrons; and two of them, Nicholas V. and Pius II., were themselves scholars of high distinction. The Dukes of Milan, and the Marquises of Mantua and Ferrara, surrounded themselves in their capitals with men illustrious in science and letters, and seemed to vie with each other in the favors which they lavished upon them. In the hitherto free republic of Florence, which had given birth to Dante, Petrarch, and Boccaccio, literature found support in a family which, at no distant period, employed it to augment their power, and to rule the city with an almost despotic sway. The Medici had been long distinguished for the wealth they had acquired by commercial enterprise, and for the high offices which they held in the republic. Cosmo de' Medici had acquired a degree of power which shook the very foundations of the state. He was master of the moneyed credit of Europe, and almost the equal of the kings with whom he negotiated; but in the midst of the projects of his ambition he opened his palace as an asylum to the scholars and artists of the age, turned its gardens into an academy, and effected a revolution in philosophy by setting up the authority of Plato against that of Aristotle. His banks, which were scattered over Europe, were placed at the service of literature as well as commerce. His agents abroad sold spices and bought manuscripts; the vessels which returned to him from Constantinople, Alexandria, and Smyrna were often laden with volumes in the Greek, Syriac, and Chaldaic languages. Being banished to Venice, he continued his protection of letters, and on his return to Florence he devoted himself more than ever to the cause of literature. In the south of Italy, Alphonso V., and, indeed, all the sovereigns of that age, pursued the same course, and chose for their chancellors and ambassadors the same scholars who educated their sons and expounded the classics in their literary circles.