He also doubled the three old centuries of Knights and added twelve more, still keeping the old names, and by this simple and prudent method, succeeded in making a distinction between the body of Knights and the people, without a murmur from the latter.

To the four urban tribes Servius added fifteen others called rural tribes, because they consisted of those who lived in the country, divided into fifteen cantons. Subsequently, fifteen more were created, and the Roman people finally found itself divided into thirty-five tribes, as it remained down to the end of the Republic.