For 10 points, name this son of Pepin the Short, a Carolingian king who was crowned the first Holy Roman Emperor.
This man sent missionaries to the Baltic states after accepting the surrender of Veleti leader Dragovit. A biographer of this ruler also served as the secretary to his successor, Louis the Pious. That man, Einhard, was also employed alongside this man's advisor Alcuin of York. His troops were joined by those of Sulayman al-Arabi during the botched invasion of Zaragoza, which led to a retreat through Roncevaux Pass where his rear guard was ambushed. For 10 points, name this son of Pepin the Short, a Carolingian king who was crowned the first Holy Roman Emperor.
This man sent missionaries to the Baltic states after accepting the surrender of Veleti leader Dragovit.
Charlemagne [accept Charles the Great; or Carolus Magnus; or Karl der Grosse] &lt;NB&gt;