A member of the impoverished branch of a distinguished family, he entered (1498) the political service of the Florentine republic and rose rapidly in importance. As defense secretary he substituted (1506) a citizens' militia for the mercenary system then prevailing in Italy. This reform sprang from his conviction, set forth in his major works, that the employment of mercenaries had largely contributed to the political weakness of Italy. Machiavelli became acquainted with power politics through his important diplomatic missions. He met Cesare Borgia twice and was sent by way of Florence to Louis XII of France (1504, 1510), to Pope Julius II (1506), and to Holy Roman Emperor Maximilian I (1507).
The Medicis' return (1512) to Florence caused his dismissal; in 1513 he was briefly imprisoned and was tortured for his alleged complicity in a plot against the Medici. Machiavelli retired to his country estate, where he wrote his chief works. He humiliated himself before the Medici in a vain attempt to recover office. When, in 1527, the republic was briefly reestablished, Machiavelli was distrusted by many of the republicans, and he died thoroughly disappointed and embittered.
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