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.
Joseph Ferdinand of Bavaria Joseph Ferdinand Leopold of Bavaria (28 October 1692 – 6 February 1699) was the son of Maximilian II Emanuel, Elector of Bavaria (1679–1705, 1714–1726) and his first wife, Maria Antonia of Austria, daughter of Leopold I, Holy Roman Emperor, maternal granddaughter of King Felipe IV of Spain.