Imperial Diet (Holy Roman Empire)

Timeline

1. c. 1150–1273Royal cities throughout the Holy Roman Empire · Holy Roman EmpireThe Holy Roman Emperor convened princes and ecclesiastical leaders for the Hoftag to discuss warfare, fiefs, and imperial order; the assemblies were irregular and their locations varied, but conventions of estate attendance and deliberative resolution had already formed, making it the direct predecessor of the Reichstag.
2. 1308–1310Frankfurt and across the Empire · FrankfurtAfter Albert I was assassinated in 1308, electors and princes assembled in Frankfurt and elsewhere to discuss the imperial succession; such assemblies were frequent between 1301 and 1310, involving the election of Henry VII of Luxembourg and coordination of policy toward Bohemia and Italy, demonstrating the Imperial Diet's role as a crisis-response mechanism.
3. c. 1350–1495Imperial cities such as Nuremberg and Regensburg · GermanyIn the mid-to-late 14th century, city representatives gradually joined the imperial assemblies, forming a four-estate structure of electors, princes, the Church, and cities; the 1495 Worms reforms established permanent institutions such as the Reichskammergericht, and the Imperial Diet turned from an ad hoc assembly into a more stable constitutional consultative platform.