In 1520 the Florentine merchants again had recourse to Machiavelli to settle their difficulties with Lucca, but this year was chiefly remarkable for his re-entry into Florentine literary society, where he was much sought after, and also for the production of his “Art of War.” It was in the same year that he received a commission at the instance of
Cardinal de’ Medici to write the “History of Florence,” a task which occupied him until 1525. His return to popular favour may have determined the Medici to give him this employment, for an old writer observes that “an able statesman out of work, like a huge whale, will endeavour to overturn the ship unless he has an empty cask to play with.” - The Prince, Niccolo Machiavelli