Carloman of Bavaria was the eldest grandson of what descendant of Charlemagne?
Louis the German Louis (also Ludwig or Lewis) "the German" (c. 802-876), also known as Louis II, was the first king of East Francia. Grandson of emperor Charlemagne and the third son of emperor of Francia, Louis the Pious and his first wife, Ermengarde of Hesbaye, he received the appellation "Germanicus" shortly after his death in recognition of the fact that the bulk of his kingdom was in the former Germania.
Charles Gonzaga, Duke of Mantua and Montferrat Charles Gonzaga (Italian: Carlo I Gonzaga ) (6 May 1580 – 22 September 1637) was Duke of Mantua and Duke of Montferrat from 1627 until his death. He was also Charles III Duke of Nevers and Rethel, as well as Prince of Arche and Charleville