text: The work of scholars at Bologna under an emperor of this name enabled that emperor's rehabilitation of Justinian's Corpus Juris Civilis.
full_question: The work of scholars at Bologna under an emperor of this name enabled that emperor's rehabilitation of Justinian's Corpus Juris Civilis. An incredible emperor with this name spoke six languages, including Greek and Arabic, and established such an advanced literary culture and bureaucracy in Southern Italy that he was called stupor mundi by contemporaries. Another emperor with this name was defeated by the Lombard League at the Battle of Legnano. That emperor's armor weighed him down while was crossing the Saleph river, leading him to drown while on the way to the Third Crusade. For 10 points, give this name of the Holy Roman Emperor known as "Barbarossa."
first_sentence: The work of scholars at Bologna under an emperor of this name enabled that emperor's rehabilitation of Justinian's Corpus Juris Civilis.
raw_answer: Frederick [or Friedrich]