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Medieval Sourcebook: Bartolo of Sassoferrato, Treatise on City Government, c. 1330

I ask then, of the three bad forms of government, which is worse. In this matter all the philosophers says that a tyranny is the worst principate, and occupies the final degree of malice. And the same Aegidius in his book said, as has been said, that a government is called good insofar as it tends toward the common good. But under a tyranny the common good is looked to least: whence a tyranny is the worst principate. Whence if several are ruling, who are held to be wealthy and good, or the multitude rules, even if these rulers incline to their own good, which is indeed not of God, and thus it is a rule "of the bad" or "of a perverse populace," nevertheless it would not diverge much from the intention of the common good; because, since they are many, they know something about the nature of the common good. But if the tyrant is a single person then he does recede from the common good. Furthermore, since virtue united for a good thing is better, virtue united for a bad thing is worse.[70] That a tyrant is the worst is so obvious as to require no demonstration. and what was said above, that the rule of several bad men is not so bad as the rule of a single tyrant, should be understood to be true when the many tend to one purpose, and can do nothing except together: it is a different matter if each exercises his own tyranny, so that one cares not about the other, as I said above concerning the monstrous regime which now exists in Rome. Similarly when in one body there is a single corrupt humor which predominates and is bad; but if all the humors are corrupted they oppose each other etc., as has already

29 been said. Woe then to that city which has many tyrants with no common ground. This warning should be made, that the rule of several bad men or of a perverse people does not last long, but easily turns into a one-man tyranny; we often see this actually happen. This is God's own will, as it is written: "He who makes a hypocrite to rule, for the sins of the people," Job 34, [71] and because Italy today is full up with tyrants.

Related links:
Bartolo da Sassoferrato - Wikipedia
Bartolo's De Insigniis et Armis