Austria and the other Habsburg states, in common with other medieval European states, possessed a political system in which the prince shared power with a representative body, or diet, to which several estates were summoned by the prince to give him aid and counsel. By the fifteenth century, the Habsburg states had developed representative institutions which would exist until 1848. In order to understand the longevity of the Austrian estates, I believe that it is necessary to examine their origins in the medieval period.