The Electoral Palatinate or the Palatinate, officially the Electorate of the Palatinate, was a constituent state of the Holy Roman Empire. The electorate had its origins under the rulership of the Counts Palatine of Lotharingia in 915; it was then restructured under the Counts Palatine of the Rhine in 1085. From 1214 until the Electoral Palatinate was merged into the Kingdom of Bavaria in 1805, the House of Wittelsbach provided the Counts Palatine or Electors. These counts palatine of the Rhine would serve as prince-electors from "time immemorial", and were noted as such in a papal letter of 1261; they were confirmed as electors by the Golden Bull of 1356.

An Imperial State or Imperial Estate was a part of the Holy Roman Empire with representation and the right to vote in the Imperial Diet. 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.