Alessandro dei Medici, the reputed son of Lorenzo by a mulatto woman, was now made hereditary ruler of Florence by the Emperor, whose illegitimate daughter he married, and by the Pope. For a time, the Duke behaved with some decency; but after the death of Clement in 1534, he showed himself in his true light as a most abominable tyrant, and would even have murdered Michelangelo, who had been working upon the tombs of Giuliano and Lorenzo. "It was certainly by God's aid," writes Condivi, "that he happened to be away from Florence when Clement died." Alessandro appears to have poisoned his kinsman, the Cardinal Ippolito, the other illegitimate remnant of the elder Medicean line, in whom he dreaded a possible rival. Associated with him in his worst excesses was a legitimate scion of the younger branch of the house, Lorenzino--the _Lorenzaccio_ of Alfred de Musset's drama--who was the grandson of the Lorenzo di Pier Francesco mentioned in the previous chapter.[26] On January 5th, 1537, this young man--a reckless libertine, half scholar and half madman--stabbed the Duke Alessandro to death with the aid of a bravo, and fled, only to find a dishonourable grave some ten years later in Venice. [26] See the Genealogical Table of the Medici. [Illustration: THE DAWN BY MICHELANGELO] Florence now fell into the hands of the ablest and most ruthless of all her rulers, Cosimo I. (the son of Giovanni delle Bande Nere), who united Medicean craft with the brutality of the Sforzas, conquered Siena, and became the first Grand Duke of Tuscany. At the opening of his reign the Florentine exiles, headed by the Strozzi and by Baccio Valori, attempted to recover the State, but were defeated by Cosimo's mercenaries. Their leaders were relentlessly put to death; and Filippo Strozzi, after prolonged torture, was either murdered in prison or committed suicide. A word will be said presently, in chapter ix., on Cosimo's descendants, the Medicean Grand Dukes who reigned in Tuscany for two hundred years. The older generation of artists had passed away with the Republic. After the siege Michelangelo alone remained, compelled to labour upon the Medicean tombs in San Lorenzo, which have become a monument, less to the tyrants for whom he reared them, than to the _saeva indignatio_ of the great master himself at the downfall of his country. A madrigal of his, written either in the days of Alessandro or at the beginning of Cosimo's reign, expresses what was in his heart. Symonds renders it:-- "Lady, for joy of lovers numberless Thou wast created fair as angels are; Sure God hath fallen asleep in heaven afar, When one man calls the bliss of many his."