events

The Athenian coup succeeds, forming a short-lived oligarchy.

Athenian coup of 411 BC

'The Four Hundred' oligarchy replaces the democratic government

The Athenian coup of 411 BC was the result of a revolution that took place during the Peloponnesian War between Athens and Sparta. The coup overthrew the democratic government of ancient Athens and replaced it with a short-lived oligarchy known as the Four Hundred.
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Oligarchy

Form of government with small ruling class

Oligarchy is a form of government in which power rests with a small number of people. Leaders of such regimes are often referred to as oligarchs, and generally are characterized by having titles of nobility or high amounts of wealth.
Source: Wikipedia (CC BY-SA)