The term curiae is an academic technical term for a concept of order used to describe a central structural feature of the estatist process of decision-making (Estates of the realm). Otto Hintze was probably responsible for the broad acceptance of the term. In his effort to work out a “typology of the estatist constitutions of the West,” in 1930 he made a distinction between the so-called tricameral system (three chambers or curiae) and the bicameral system (two chambers or curiae) [4].