Tyrant

Tyrant is a term for someone with absolute governmental power, from the Greek language turannos. In Classical Antiquity[?] it did not always have inherently negative implications, it merely designated anyone who assumed power for any period of time without a legitimate basis of authority.

The first to have the title of "Tyrant" was Pisistratus in 560 BC.

In modern times Tyrant has come to mean a dictator who rules with cruelty.

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Bullying is a form of tyranny within a family, among schoolchildren, etc.