The reason for there being many different sorts of governments is this, that each state consists of a great number of parts; for, in the first place, we see that all cities are made up of families: and again, of the multitude of these some must be rich, some poor, and others in the middle station; and that, both of the rich and poor, some will be used to arms, others not. We see also, that some of the common people are husbandmen, others attend the market, and others are artificers. There is also a difference between the nobles in their wealth, and the dignity in which they live: for instance, in the number of horses they breed; for this cannot be supported without a large fortune: for which reason, in former times, those cities whose strength consisted in horse became by that means oligarchies; and they used horse in their expeditions against the neighbouring cities; as the Eretrians the Chalcidians, the Magnetians, who lived near the river Meander, and many others in Asia. Moreover, besides the difference of fortune, there is that which arises from family and merit; or, if there are any other distinctions [1290a] which make part of the city, they have been already mentioned in treating of an aristocracy, for there we considered how many parts each city must necessarily be composed of; and sometimes each of these have a share in the government, sometimes a few, sometimes more.
It is evident then, that there must be many forms of government, differing from each other in their particular constitution: for the parts of which they are composed each differ from the other. For government is the ordering of the magistracies of the state; and these the community share between themselves, either as they can attain them by force, or according to some common equality which there is amongst them, as poverty, wealth, or something which they both partake of. There must therefore necessarily be as many different forms of governments as there