 If legitimacy is interpreted descriptively, it refers to people’s beliefs about political authority and, sometimes, political obligations. In his sociology, Max Weber put forward a very influential account of legitimacy that excludes any recourse to normative criteria (Mommsen 1989: 20). According to Weber, that a political regime is legitimate means that its participants have certain beliefs or faith (“Legitimitätsglaube”) in regard to it: “the basis of every system of authority, and correspondingly of every kind of willingness to obey, is a belief, a belief by virtue of which persons exercising authority are lent prestige” (Weber 1964: 382). As is well known, Weber distinguishes among three main sources of legitimacy—understood as the acceptance both of authority and of the need to obey its commands. People may have faith in a particular political or social order because it has been there for a long time (tradition), because they have faith in the rulers (charisma), or because they trust its legality—specifically the rationality of the rule of law (Weber 1990 [1918]; 1964). Weber identifies legitimacy as an important explanatory category for social science, because faith in a particular social order produces social regularities that are more stable than those that result from the pursuit of self-interest or from habitual rule-following (Weber 1964: 124).