Cosimo dei Medici rid himself of enemies by the unscrupulous method of his predecessors, driving outside the walls the followers of any party that opposed him. He had determined to control the Florentines so cleverly that they should not realize his tyranny. He was quite willing to spend the hoards of his ancestors on the adornment of the state he governed, and, among other things, he built the famous convent of St Mark. Fra Angelico, the painter-monk, was given the work of covering its white walls with the frescoes in which the monks delighted. Cosimo gained thereby the reputation of liberality and gracious interest in the development of genius. The monk had devoted his time before this to the illuminations of manuscripts, and was delighted to work for the glory of God in such a way that all the convent might behold it. He wished for neither profit not praise for himself, but he knew that his beautiful vision would be inherited by his Church, and that they might inspire others of his brethren. The Golden Age of Italian art was in its heyday under Cosimo dei Medici. Painters and architects had not been disturbed by the tumults that drew the rival factions from their daily labours. They had been constructing marvellous edifices in Florence even during the time when party feeling ran so high that it would have sacrificed the very existence of the city to its rancours. {32} The noble Cathedral had begun to rise before Dante had been banished, but there was no belfry till 1334 when Giotto laid the foundation-stone of the _Campanile_, whence the bells would ring through many centuries. The artist had completed his masterpiece in 1387, two years before the birth of Cosimo. It was an incentive to patriotic Florentines to add to the noble buildings of their city. The Church of San Lorenzo owed its existence to the House of Medici, which appealed to the people by lavish appreciation of all genius.