Toward the close of the 13th century, and throughout the 14th, a national literature, in prose and poetry, sprang up in Italy, which in several respects has close relations to the history of the church. The three Florentines, Dante, Petrarch and Boccaccio, boldly burst through the barriers of traditional usage, which had made Latin the only vehicle for literature and science, and became the creators of a beautiful Italian style; while their example powerfully influenced their own countrymen, and those of other western nations, during the immediately succeeding ages. The exclusive use of the Latin language had produced a uniform hierarchical spirit, and was a restraint to the anti-hierarchical movements of the age after independent national development in church and State. The breaking down of this barrier to progress was an important step. But all the three great men of letters whom we have named were also highly distinguished for their classical culture. They introduced the study of the ancient classics, and were thus the precursors of the humanists. They also presented a united front against the corruptions of the church, against hierarchical pretensions, the greed and moral debasement of the papacy, as well as against the moral and intellectual degradation of the clergy and the monks. Petrarch and Boccaccio too warred against the depraved scholasticism. The Augustan age of German national poetry was contemporary with the age of the Hohenstaufens. It consisted in popular songs, these often of a sacred character. During the 14th century the sacred drama reached the highest point of its development, especially in Germany, England, France, and Spain. The spirit of the Renaissance, which during the 15th century dominated Italian art, made itself felt also in the domain of ecclesiastical architecture and painting.