A tyrant (Latin Tyrranis, from Greek τύραννος týrannos) possesses absolute power through the people in a state or in an organization: one refers to this mode of rule as a tyranny. In ancient Greece, tyrants were generally aristocrats who had gained power over the others by getting the support of the poor people by giving them land, freeing them from slavery, etc. Support for the tyrants came from the growing class of business people and from the peasants who had no land or were in debt to the wealthy land owners. It is true that they had no legal right to rule, but the people preferred them over kings or the aristocrats. The Greek tyrants stayed in power by using mercenary soldiers from outside of their respective city state.
The heyday of the classical Hellenic tyrants came in the early 6th century BC, when Cleisthenes ruled Sicyon in the Peloponnesus, and Polycrates ruled Samos. During this time, revolts overthrew many governments in the Aegean world. Simultaneously Persia first started making inroads into Greece, and many tyrants sought Persian help against forces seeking to remove them.
Greek tyranny in the main grew out of the struggle of the popular classes against the aristocracy or against priest-kings where archaic traditions and mythology sanctioned hereditary and/or traditional rights to rule. Popular coups generally installed tyrants, who often became or remained popular rulers, at least in the early part of their reigns. For instance, the popular imagination remembered Pisistratus for an episode (related by *Aristotle, but possibly fictional) in which he exempted a farmer from taxation because of the particular barrenness of his plot. Pisistratus' sons Hippias and Hipparchus, on the other hand, were not such able rulers and when the disaffected aristocrats Harmodios and Aristogeiton slew Hipparchus, Hippias' rule quickly became oppressive, resulting in the expulsion of the Peisistratids in 510.
The tyrannies of Sicily came about due to similar causes, but here the threat of Carthaginian attack prolonged tyranny, facilitating the rise of military leaders with the people united behind them. Such Sicilian tyrants as Gelo, Hiero I, Hiero II, Dionysius the Elder, and Dionysius the Younger maintained lavish courts and became patrons of culture.
Later ancient Greeks, as well as the Roman Republicans, became generally quite wary of anyone seeking to implement a popular coup. Shakespeare portrays the struggle of one such anti-tyrannical Roman, Marcus Junius Brutus, in his play Julius Caesar.
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