Prince-Elector
member of the electoral college of the Holy Roman Empire, electing the King and then Emperor of the Romans
en-US/ˈpɹɪns - ɪˈlɛktɚ/
en-GB/ˈpɹɪns - ɪˈlɛktə/
member of the electoral college of the Holy Roman Empire, electing the King and then Emperor of the Romans