<P> Occasionally the First and Second Chamber meet in a Verenigde Vergadering (Joint Session), for instance on Prinsjesdag, the annual opening of the parliamentary year, and when a new king is inaugurated . </P> <P> The Holy Roman Empire had the Imperial Diet (Reichstag). The clergy was represented by the independent prince - bishops, prince - archbishops and prince - abbots of the many monasteries . The nobility consisted of independent aristocratic rulers: secular prince - electors, kings, dukes, margraves, counts and others . Burghers consisted of representatives of the independent imperial cities . Many peoples whose territories within the Holy Roman Empire had been independent for centuries had no representatives in the Imperial Diet, and this included the Imperial Knights and independent villages . The power of the Imperial Diet was limited, despite efforts of centralization . </P> <P> Large realms of the nobility or clergy had estates of their own that could wield great power in local affairs . Power struggles between ruler and estates were comparable to similar events in the history of the British and French parliaments . </P> <P> The Swabian League, a significant regional power in its part of Germany during the 15th Century, also had its own kind of Estates, a governing Federal Council comprising three Colleges: those of Princes, Cities, and Knights . </P>

Who made up the 1st 2nd and 3rd estates