The Confederated States of the Rhine, simply known as the Confederation of the Rhine, also known as Napoleonic Germany, was a confederation of German client states established at the behest of Napoleon some months after he defeated Austria and Russia at the Battle of Austerlitz. Its creation brought about the dissolution of the Holy Roman Empire shortly afterward. The Confederation of the Rhine lasted from 1806 to 1813.The founding members of the confederation were German princes of the Holy Roman Empire. They were later joined by 19 others, altogether ruling a total of over 15 million subjects. This granted a significant strategic advantage to the French Empire on its eastern frontier by providing a buffer between France and the two largest German states, Prussia and Austria (which also controlled substantial non-German lands).

An Imperial State or Imperial Estate (Latin: Status Imperii; German: Reichsstand, plural: Reichsstände) was a part of the Holy Roman Empire with representation and the right to vote in the Imperial Diet (Reichstag). Rulers of these Estates were able to exercise significant rights and privileges and were "immediate", meaning that the only authority above them was the Holy Roman Emperor. They were thus able to rule their territories with a considerable degree of autonomy.

The system of imperial states replaced the more regular division of Germany into stem duchies in the early medieval period.

The old Carolingian stem duchies were retained as the major divisions of Germany under the Salian dynasty, but they became increasingly obsolete during the early high medieval period under the Hohenstaufen, and they were finally abolished in 1180 by Frederick Barbarossa in favour of more numerous territorial divisions. From 1489, the imperial Estates represented in the Diet were divided into three chambers, the college of prince-electors (Kurfürstenkollegium/den Kurfürstenrat), the college of imperial princes (Reichsfürstenrat) and the college of imperial cities. Counts and nobles were not directly represented in the Diet in spite of their immediate status, but were grouped into "benches" (Grafenbänke) with a single vote each.

Imperial Knights had immediate status but were not represented in the Diet.