The Prince is a 16th-century political treatise written by the Italian diplomat, philosopher, and political theorist Niccolò Machiavelli in the form of a realistic instruction guide for new princes. As a remarkable general theme, The Prince appears to take it for granted that immoral acts are justified if they can help achieve political glory.
A 16th-century Italian impression of the family of Darius III, emperor of Persia, before their conqueror, Alexander the Great: Machiavelli explained that in his time the Near East was again ruled by an empire, the Ottoman Empire, with similar characteristics to that of Darius—seen from the viewpoint of a potential conqueror.
Machiavelli described Moses as a conquering prince, who founded new modes and orders by force of arms, which he used willingly to kill many of his own people. Other sources describe the reasons behind his success differently.
Leo X: a pope, but also a member of the Medici family. Machiavelli suggested they should treat the church as a princedom, as the Borgia family had, in order to conquer Italy, and found new modes and orders.
Cesare Borgia was a Spanish-Italian cardinal and condottiero, an illegitimate son of Pope Alexander VI and member of the Spanish-Aragonese House of Borgia. His fight for power was a major inspiration for The Prince by Niccolò Machiavelli.
Cesare as a boy, painted by Pinturicchio
Portrait traditionally said to depict Cesare Borgia, by Altobello Melone
Cesare Borgia leaving the Vatican (1877) by Giuseppe Lorenzo Gatteri