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.
Rudolf I, Duke of Bavaria Rudolf I of Bavaria, called "the Stammerer" (German: "Rudolf der Stammler" ; 4 October 1274 – 12 August 1319), a member of the Wittelsbach dynasty, was Duke of Bavaria and Count Palatine of the Rhine from 1294 until 1317.