Niccolò Machiavelli (3 May 1469 – 21 June 1527), or more formally Niccolò di Bernardo dei Machiavelli, was an Italian Renaissance historian, politician, diplomat, philosopher, humanist, and writer. He has often been called the founder of modern political science. He was for many years a senior official in the Florentine Republic, with responsibilities in diplomatic and military affairs. He also wrote comedies, carnival songs, and poetry. His personal correspondence is renowned in the Italian language. He was secretary to the Second Chancery of the Republic of Florence from 1498 to 1512, when the Medici were out of power. He wrote his most renowned work The Prince (Il Principe) in 1513.
"Machiavellianism" is a widely used negative term to characterize unscrupulous politicians of the sort Machiavelli described most famously in The Prince. Machiavelli described immoral behavior, such as dishonesty and killing innocents, as being normal and effective in politics. He even seemed to endorse it in some situations. The book itself gained notoriety when some readers claimed that the author was teaching evil, and providing "evil recommendations to tyrants to help them maintain their power." The term "Machiavellian" is often associated with political deceit, deviousness, and realpolitik. On the other hand, many commentators, such as Baruch Spinoza, Jean-Jacques Rousseau and Denis Diderot, have argued that Machiavelli was actually a republican, even when writing The Prince, and his writings were an inspiration to Enlightenment proponents of modern democratic political philosophy. In one place for example he noted his admiration for the selfless Roman dictator Cincinnatus.
SERIES “Collected Works by Niccolò Machiavelli”:
Volume I
A DESCRIPTION OF THE METHODS ADOPTED BY THE DUKE VALENTINO WHEN MURDERING VITELLOZZO VITELLI, OLIVEROTTO DA FERMO, THE SIGNOR PAGOLO, AND THE DUKE DI GRAVINA ORSINI [1502]
THE PRINCE [1513]

Volume II
DISCOURSES ON LIVY [1512-17]

Volume III
THE ART OF WAR [1519-20]

Volume IV
THE LIFE OF CASTRUCCIO CASTRACANI OF LUCCA [1520]
HISTORY OF FLORENCE, AND OF THE AFFAIRS OF ITALY, FROM THE EARLIEST TIMES TO THE DEATH OF LORENZO THE MAGNIFICENT [1521-5]