Rupert was born at Amberg in the Upper Palatinate, the son of Elector Palatine Rupert II and Beatrice of Aragon, daughter of King Peter II of Sicily. Rupert's great-granduncle was the Wittelsbach emperor Louis IV. He was raised at the Dominican Liebenau monastery near Worms, where his widowed grandmother Irmengard of Oettingen lived as a nun.
Reign as Elector Frederick Christian as Elector of Saxony. One of his first acts as Elector was the dismissal of the extremely unpopular prime minister, the Count Heinrich von Brühl , who had plunged Saxony into crisis, first with his failed economic policy, but particularly by his catastrophic foreign policy, which caused the Electorate to become involved in the Seven Years' War .