It now remains to treat of a tyranny; not that there is [1295a] much to be said on that subject, but as it makes part of our plan, since we enumerated it amongst our different sorts of governments. In the beginning of this work we inquired into the nature of kingly government, and entered into a particular examination of what was most properly called so, and whether it was advantageous to a state or not, and what it should be, and how established; and we divided a tyranny into two pieces when we were upon this subject, because there is something analogous between this and a kingly government, for they are both of them established by law; for among some of the barbarians they elect a monarch with absolute power, and formerly among the Greeks there were some such, whom they called sesumnetes. Now these differ from each other; for some possess only kingly power regulated by law, and rule those who voluntarily submit to their government; others rule despotically according to their own will. There is a third species of tyranny, most properly so called, which is the very opposite to kingly power; for this is the government of one who rules over his equals and superiors without being accountable for his conduct, and whose object is his own advantage, and not the advantage of those he governs; for which reason he rules by compulsion, for no freemen will ever willingly submit to such a government. These are the different species of tyrannies, their principles, and their causes.