The Imperial Diet (Latin: Dieta Imperii or Comitium Imperiale; German: Reichstag) was the deliberative and legislative body of the Holy Roman Empire. Its members were the Imperial Estates, divided into three colleges. The diet as a permanent, regularized institution evolved from the Hoftage (court assemblies) of the Middle Ages. From 1663 until the end of the empire in 1806, it was in permanent session at Regensburg.
The Imperial Estates had, according to feudal law, no authority above them besides the Holy Roman Emperor (or emperor-elect) himself. The holding of an Imperial Estate entitled one to a vote in the diet. Thus, an individual member might have multiple votes and votes in different colleges. In general, members did not attend the permanent diet at Regensburg, but sent representatives instead. The late imperial diet was in effect a permanent meeting of ambassadors between the Estates.
The precise role and function of the Imperial Diet changed over the centuries, as did the Empire itself, in that the estates and separate territories gained more and more control of their own affairs at the expense of imperial power. Initially, there was neither a fixed time nor location for the Diet. It started as a convention of the dukes of the old Germanic tribes that formed the Frankish kingdom when important decisions had to be made, and was probably based on the old Germanic law whereby each leader relied on the support of his leading men. For example, already under Emperor Charlemagne during the Saxon Wars, the Diet, according to the Royal Frankish Annals, met at Paderborn in 777 officially determined laws concerning the subdued Saxons and other tribes. In 803, the Frankish emperor issued the final version of the Lex Saxonum.
At the Diet of 919 in Fritzlar the dukes elected the first King of the Germans, who was a Saxon, Henry the Fowler, thus overcoming the longstanding rivalry between Franks and Saxons and laying the foundation for the German realm. After the conquest of Italy, the 1158 Diet of Roncaglia finalized four laws that would significantly alter the (never formally written) constitution of the Empire, marking the beginning of the steady decline of the central power in favour of the local dukes. The Golden Bull of 1356 cemented the concept of "territorial rule" (Landesherrschaft), the largely independent rule of the dukes over their respective territories, and also limited the number of electors to seven. The Pope, contrary to modern myth, was never involved in the electoral process but only in the process of ratification and coronation of whomever the Prince-Electors chose.
However, until the late 15th century, the Diet was not actually formalized as an institution. Instead, the dukes and other princes would irregularly convene at the court of the Emperor; these assemblies were usually referred to as Hoftage (from German Hof "court"). Only beginning in 1489 was the Diet called the Reichstag, and it was formally divided into several collegia ("colleges"). Initially, the two colleges were that of the prince-electors and that of the other dukes and princes. Later, the imperial cities, that is, cities that had Imperial immediacy and were oligarchic republics independent of a local ruler that were subject only to the Emperor himself, managed to be accepted as a third party.
Several attempts to reform the Empire and end its slow disintegration, notably starting with the Diet of 1495, did not have much effect. In contrast, this process was only hastened with the Peace of Westphalia of 1648, which formally bound the Emperor to accept all decisions made by the Diet, in effect depriving him of his few remaining powers. From then to its end in 1806, the Empire was not much more than a collection of largely independent states.
Probably the most famous Diets were those held in Worms in 1495, where the Imperial Reform was enacted, and 1521, where Martin Luther was banned (see Edict of Worms), the Diets of Speyer 1526 and 1529 (see Protestation at Speyer), and several in Nuremberg (Diet of Nuremberg). Only with the introduction of the Perpetual Diet of Regensburg in 1663 did the Diet permanently convene in a fixed location.
The Imperial Diet of Constance opened on 27 April 1507; it recognized the unity of the Holy Roman Empire and founded the Imperial Chamber, the empire’s supreme court.
Since 1489, the Diet comprised three colleges:
The number increased to eight, when in 1623 the Duke of Bavaria took over the electoral dignity of the Count Palatine, who himself received a separate vote in the electoral college according to the 1648 Peace of Westphalia (Causa Palatina), including the high office of an Archtreasurer. In 1692 the Elector of Brunswick-Lüneburg (Hannover) became the ninth Prince-elector as Archbannerbearer during the Nine Years' War.
In the War of the Bavarian Succession, the electoral dignities of the Palatinate and Bavaria were merged, approved by the 1779 Treaty of Teschen. The German Mediatisation of 1803 entailed the dissolution of the Cologne and Trier Prince-archbishoprics, the Prince-Archbishop of Mainz and German Archchancellor received—as compensation for his lost territory occupied by Revolutionary France—the newly established Principality of Regensburg. In turn, four secular princes were elevated to prince-electors:
These changes however had little effect, as with the abdication of Francis II as Holy Roman Emperor the Empire was dissolved only three years later.
The college of Imperial Princes (Reichsfürstenrat or Fürstenbank) incorporated the Imperial Counts as well as immediate lords, Prince-Bishops and Imperial abbots. Strong in members, though often discordant, the second college tried to preserve its interests against the dominance of the Prince-electors.
The House of Princes was again subdivided into an ecclesiastical and a secular bench. Remarkably, the ecclesiastical bench was headed by the—secular—Archduke of Austria and the Burgundian duke of the Habsburg Netherlands (held by Habsburg Spain from 1556). As the Austrian House of Habsburg had failed to assume the leadership of the secular bench, they received the guidance over the ecclesiastical princes instead. The first ecclesiastical prince was the Archbishop of Salzburg as Primas Germaniae; the Prince-Archbishop of Besançon, though officially a member until the 1678 Treaty of Nijmegen, did not attend the Diet's meetings.
The ecclesiastical bench also comprised the Grand Master and Deutschmeister of the Teutonic Knights, as well as the Grand Prior of the Monastic State of the Knights Hospitaller at Heitersheim. The Prince-Bishopric of Lübeck remained an ecclesiastical member even after it had turned Protestant, ruled by diocesan administrators from the House of Holstein-Gottorp from 1586. The Prince-Bishopric of Osnabrück, according to the 1648 Peace of Westphalia was under alternating rule of a Catholic bishop and a Lutheran bishop from the House of Brunswick-Lüneburg.
Each member of the Princes' College held either a single vote (Virilstimme) or a collective vote (Kuriatstimme). Due to the Princes, their single vote from 1582 strictly depended on their immediate fiefs; this principle led to an accumulation of votes, when one ruler held several territories in personal union. Counts and Lords only were entitled to collective votes, they therefore formed separate colleges like the Wetterau Association of Imperial Counts and mergers within the Swabian, the Franconian and the Lower Rhenish–Westphalian Circles. Likewise, on the ecclesiastical bench, the Imperial abbots joined a Swabian or Rhenish college.
In the German Mediatisation of 1803, numerous ecclesiastical territories were annexed by secular estates. A reform of the Princes' college was however not carried out until the Empire's dissolution in 1806.
The college of Imperial Cities (Reichsstädtekollegium) evolved from 1489 onwards, it contributed greatly to the development of the Imperial Diets as a political institution. Nevertheless, the collective vote of the cities initially was of inferior importance until a 1582 Recess of the Augsburg Diet. The college was led by the city council of the actual venue; with the implementation of the Perpetual Diet in 1663, the chair passed to Regensburg.
For a complete list of members of the Imperial Diet from 1792, near the end of the Empire, see List of Reichstag participants (1792).
After the Peace of Westphalia, religious matters could no longer be decided by a majority vote of the colleges. Instead, the Reichstag would separate into Catholic and Protestant bodies, which would discuss the matter separately and then negotiate an agreement with each other. The Catholic body, or corpus catholicum, was headed by the Archbishop-Elector of Mainz.
The Protestant body, or corpus evangelicorum, was headed by the Elector of Saxony. At meetings of the Protestant body, Saxony would introduce each topic of discussion, after which Brandenburg-Prussia and Hanover would speak, followed by the remaining states in order of size. When all the states had spoken, Saxony would weigh the votes and announce a consensus.
Frederick Augustus I, Elector of Saxony converted to Catholicism in 1697 in order to become King of Poland, but the Electorate itself remained officially Protestant and retained the directorship of the Protestant body. When the Elector's son also converted to Catholicism, Prussia and Hanover attempted to take over the directorship in 1717–1720, but without success. The Electors of Saxony would head the Protestant body until the end of the Holy Roman Empire.
After the formation of the new German Empire in 1871, the Historical Commission of the Bavarian Academy of Sciences started to collect imperial records (Reichsakten) and imperial diet records (Reichstagsakten). In 1893 the commission published the first volume. At present the years 1524–1527 and years up to 1544 are being collected and researched. A volume dealing with the 1532 Diet of Regensburg, including the peace negotiations with the Protestants in Schweinfurt and Nuremberg, by Rosemarie Aulinger of Vienna was published in 1992.
|754||Quierzy-sur-Oise||Pepin the Short||Donation of Pepin to Pope Stephen II|
|777||Paderborn||Charlemagne||First Diet on Saxon soil, Duke Widukind refused to appear|
|782||Lippspringe||Charlemagne||Division of Saxony into Gaue under Frankish Grafen (counts)|
|788||Ingelheim am Rhein||Charlemagne||Deposition of Duke Tassilo III of Bavaria|
|799||Paderborn||Charlemagne||Charlemagne clears with Pope Leo III his installation as Emperor|
|806||Diedenhofen||Charlemagne||Division of the Carolingian Empire among Pepin of Italy, Charles the Younger and Louis the Pious|
|826||?||Invitation of the Sorbs;|
|835||Diedenhofen||Louis the Pious|
|838||Speyer||Louis the Pious|
|872||Forchheim||Louis the German|
|874||Forchheim||Louis the German||Discussion and regulation of inheritance|
|889||Forchheim||Arnulf of Carinthia|
|892||Forchheim||Arnulf of Carinthia||Preparing a War against the Slavs|
|896||Forchheim||Arnulf of Carinthia|
|903||Forchheim||Louis the Child||Execution of the Babenberg Rebel Adalhard|
|907||Forchheim||Louis the Child||Council about the Magyar attacks|
|911||Forchheim||Election of Conrad of Franconia King|
|914||Forchheim||Conrad of Franconia||War against Arnulf I of Bavaria|
|926||Worms||Henry the Fowler|
|952||on the Lech meadows near Augsburg||Otto I the Great|
|961||Forchheim||Otto I the Great|
|978||Dortmund||Otto II||War against France in the Autumn|
|983||Verona||Election of Otto III|
|985||End of the usurpation of Henry the Wrangler|
|1146||Speyer||Conrad III||Decision to participate in the Second Crusade|
|1152||Dortmund/Merseburg||Frederick I Barbarossa|
|1157||Bisanz||Frederick I Barbarossa|
|1158||Diet of Roncaglia near Piacenza||Frederick I Barbarossa|
|1165||Würzburg||Frederick I Barbarossa|
|1168||Bamberg||Frederick I Barbarossa / Henry VI|
|1178||Speyer||Frederick I Barbarossa|
|1180||Gelnhausen||Frederick I Barbarossa / Henry VI||Investiture of the Archbishop of Cologne with the Duchy of Westphalia|
|1181||Erfurt||Henry VI||Exile of Henry the Lion|
|1190||Schwäbisch Hall||Henry VI||Abolishment of the Duchy of Lower Lorraine|
|1193||Speyer||Henry VI||Trial of Richard I|
|1205||Speyer||Philip of Swabia|
|1213||Speyer||Frederick II||Frederick has his uncle, Philip of Swabia, who was murdered 1208 in Bamberg, interred in the Speyer cathedral|
|1356||Nuremberg||Charles IV||Issuance of the Golden Bull|
|1389||Eger||Wenceslaus||Peace of Eger|
|1488||Esslingen||Frederick III||Formation of the Swabian League|
|1495||Worms||Maximilian I||Imperial Reform; Common Penny in the wake of the Swabian War|
|1505||Cologne||Arbitration ending the War of the Succession of Landshut|
|1512||Trier/Cologne||10 Imperial Circles|
|1521||Worms||Charles V||Diet of Worms, ban of Martin Luther, Edict of Worms|
|1526||Speyer I||Diet of Speyer (1526), Suspension of the Edict of Worms|
|1529||Speyer II||Diet of Speyer (1529), Reinstatement of the Edict of Worms, Protestation at Speyer. Proclamation of the Wiedertäufermandat condemning Anabaptists|
|1530||Augsburg||Diet of Augsburg presentation of the Augsburg Confession|
|1532||Regensburg||Ferdinand I||Constitutio Criminalis Carolina|
|1555||Augsburg||Peace of Augsburg|
|1570||Speyer||The infantry of the Empire gained a comprehensive military code|
|1653/54||Regensburg||Ferdinand III.||The Youngest Recess (Jüngster Reichsabschied / recessus imperii novissimus)|
|1663–1806||in the Reichssaal
of the Regensburg town hall
as the Perpetual Diet
In religious and all other affairs in which the estates cannot be considered as one body, and when the Catholic estates and those of the Augsburg Confession are divided into two parties, the dispute is to be decided by amicable agreement alone, and neither side is to be bound by a majority vote.