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.
Carloman II Carloman II ( 866 – 12 December 884) was the King of West Francia from 879 until his death. A member of the Carolingian dynasty, he and his elder brother, Louis III, divided the kingdom between themselves and ruled jointly until the latter's death in 882. Thereafter Carloman ruled alone until his own death. He was the second son of King Louis the Stammerer and Queen Ansgarde.