Baron de Montesquieu is most closely associated with separation of state powers: executive, legislative, judicial; classification of systems of government based on their principles
Montesquieu's most influential work divided French society into three classes the monarchy, the aristocracy, and the commons. Montesquieu saw two types of governmental power existing: the sovereign and the administrative. The administrative powers were the executive, the legislative, and the judicial. These should be separate from and dependent upon each other so that the influence of any one power would not be able to exceed that of the other two, either singly or in combination. This was a radical idea because it completely eliminated the three Estates structure of the French Monarchy: the clergy, the aristocracy, and the people at large represented by the Estates-General, thereby erasing the last vestige of a feudalistic structure.
