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Of governments there are said to be only two forms - democracy and oligarchy. For aristocracy is considered to be a kind of oligarchy, as being the rule of a few, and the so-called constitutional government to be really a democracy.

Aristotle, Stephen Everson (1996). “Aristotle: The Politics and the Constitution of Athens”, p.95, Cambridge University Press
Of governments there are said to be only two forms - democracy and oligarchy. For aristocracy is considered to be a kind of oligarchy, as being the rule of a few, and the so-called constitutional government to be really