The thing that these people have most in common with one another is that they all tried to be absolute rulers (I assume you are talking especially about King Louis XIV of France).
All of these men ruled over their countries more or less absolutely. The first two of them ruled because they were kings, Saddam Hussein ruled because he had managed to take power by working his way up through the ranks of his political party. But how they got power does not really matter. What matters, what they have in common, is that they all held all of the important power in their societies. They did not have to listen to what any sort of parliament said or what their people wanted.
In short, then, these men were all absolute rulers or dictators if you want to use that term.