Frederick II., called the Wonder of the World, grandson of the preceding; he was crowned emperor in 1215, at Aix-la-Chapelle, having driven Otto IV. from the throne; he gave much attention to the consolidating of his Italian possessions, encouraged learning and art, founded the university of Naples, and had the laws carefully codified; in these attempts at harmonising the various elements of his empire he was opposed by the Papal power and the Lombards; in 1228 he gained possession of Jerusalem, of which he crowned himself king; his later years were spent in struggles with the Papal and Lombard powers, and darkened by the treachery of his son Henry and of an intimate friend; he was a man of outstanding intellectual force and learning, but lacked the moral greatness of his grandfather (1194‒1250).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Frederick I. * Frederick III.