He made his other son, Louis the Pious, King of Aquitaine, and the scholar Einhard was his biographer.
This man acquired Barcelona when it was relinquished to him by its governor Zeid, and he discredited Tassilo, allowing him to seize Bavaria. He banished his eldest son to the monastery of Prum, and created the Marca Hispanica. One of this man's sons, whom he made King of Italy, was initially named after his possibly-murdered brother Carloman, and the scholar Alcuin of York reformed handwriting at this man's Palace School. He made his other son, Louis the Pious, King of Aquitaine, and the scholar Einhard was his biographer. For 10 points, name this ruler who was crowned by Pope Leo III on Christmas Day, the first Holy Roman Emperor.
This man acquired Barcelona when it was relinquished to him by its governor Zeid, and he discredited Tassilo, allowing him to seize Bavaria.
Charlemagne