During the 11th century, the Palatinate was dominated by the Ezzonian dynasty, which governed several counties on both banks of the Rhine. These territories were centered around Cologne-Bonn, but extended south to the Moselle and Nahe Rivers. The southernmost point was near Alzey.
The first hereditary Count Palatine of the Rhine was Conrad of Hohenstaufen, who was the younger brother of Emperor Frederick Barbarossa. The territories attached to this hereditary office began with those held by the Hohenstaufens in Franconia and Rhineland.. Part of this land derived from their imperial ancestors, the Franconian emperors, and part from Conrad's maternal ancestors, the Saarbrücken. This explains the composition of the inheritance that comprised the Upper and Rhenish Palatinate in the following centuries.
Conrad of Hohenstaufen 1156–95
Welf Counts Palatine
In 1195, the Palatinate passed to the House of Welf through the marriage of Agnes, heir to the Staufen count.
The Palatinate under the Wittelsbach: the Electoral dignity (1214–1803)
On the marriage of the Welf heiress Agnes in the early 13th century, the territory passed to the WittelsbachDukes of Bavaria, who were also dukes and counts palatine of Bavaria. During a later division of territory among the heirs of Duke Louis II of Upper Bavaria in 1294, the elder branch of the Wittelsbachs came into possession of both the Rhenish Palatinate and the territories in Bavaria north of the Danube river centred around the town of Amberg. As this region was politically connected to the Rhenish Palatinate, the name Upper Palatinate became common from the early 16th century, to contrast with the Lower Palatinate along the Rhine. The Golden Bull of 1356, in circumvention of inner-Wittelsbach contracts and thus bypassing Bavaria, the Palatinate was recognized as one of the secular electorates. The count was given the hereditary offices of archsteward of the Empire and Imperial Vicar of Franconia, Swabia, the Rhine and southern Germany. From that time forth, the Count Palatine of the Rhine was usually known as the Elector Palatine. The position of prince-elector had existed earlier, though it is difficult to determine exactly the earliest date of the office. By the early 16th century, owing to the practice of dividing territories among different branches of the family, junior lines of the Palatine Wittelsbachs came to rule in Simmern, Kaiserslautern and Zweibrücken in the Lower Palatinate, and in Neuburg and Sulzbach in the Upper Palatinate. The Elector Palatine, now based in Heidelberg, adopted Lutheranism in the 1530s and Calvinism in the 1550s.
Electors of Bavaria and Counts Palatine of the Rhine, 1777–1803
Later history
Following the great restorations of 1815, the Lower Palatinate was restored as one of eight Bavarian Districts. After World War IIthe American Military Government of Germany took the Lower Palatinate from Bavaria and merged it with neighbouring territories to form a new state called Rhineland-Palatinate with Mainz as the state capital. The people had felt neglected by the governments in Munich for generations and later approved the merger in a plebiscite. The present head of the House of Wittelsbach, Franz, Duke of Bavaria, is still traditionally styled as His Royal Highness the Duke of Bavaria, Duke in Swabia and Franconia, Count Palatine of the Rhine.