Which son of Sophia of Hanover ruled part of the Holy Roman Empire?
George I of Great Britain George I (George Louis; German: "Georg Ludwig" ; 28 May 1660 – 11 June 1727) was King of Great Britain and Ireland from 1 August 1714 until his death, and ruler of the Duchy and Electorate of Brunswick-Lüneburg (Hanover) in the Holy Roman Empire from 1698.
Electorate of Trier The Electorate of Trier (German: "Kurfürstentum Trier" or "Kurtrier "), traditionally known in English by its French name of Trèves, was an ecclesiastical principality of the Holy Roman Empire that existed from the end of the 9th to the early 19th century. It consisted of the temporal possessions of the prince-archbishop of Trier ("Erzbistum Trier "), also prince-elector of the empire. There were only two other ecclesiastical prince-electors in the Empire: the Electorate of Cologne and the Electorate of Mainz, among which Mainz ranked first.