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.
Wala of Corbie Wala (c. 755 – 31 August 836) was a son of Bernard, son of Charles Martel, and one of the principal advisers of his cousin Charlemagne, of Charlemagne's son Louis the Pious, and of Louis's son Lothair I. He succeeded his brother Adalard as abbot of Corbie and its new daughter foundation, Corvey, in 826 or 827.