プロテスタント同盟
Rupert's father was Frederick V of the Palatinate, of the Palatinate-Simmern branch of the House of Wittelsbach. As Elector Palatine, Frederick was one of the most important princes of the Holy Roman Empire. He was also head of the Protestant Union, a coalition of Protestant German states. The Palatinate was a wealthy state, and Frederick lived in great luxury.