What was best in Arabian medicine was brought to Salerno by Constantine and, above all, his translation of many well-known Arabian medical authors proved eminently suggestive to seriously investigating physicians all over the world in his time. Before he was to be allowed to settle down to his literary work, however, Constantine was to have a very varied experience. Some of this doubtless was to be valuable in enabling him to set the old Arabian teachers of medicine properly before his generation. After his Oriental travels he returned to his native Carthage in order to practise medicine. It was not long, however, before his superior medical knowledge, or, at least, the many novelties of medical practice that he had derived from his contact with the East, drew upon him the professional jealousy of his colleagues. It is very probable that the reputation of his extensive travels and wide knowledge soon attracted a large clientele. This was followed quite naturally by the envy at least of his professional brethren. Feeling became so bitter, that even the possibility of serious personal consequences for him because of false accusations was not out of the question. Whenever novelties are introduced into medical science or medical practice, their authors are likely to meet with this opposition on the part of colleagues, and history is full of examples of it. Galvani was laughed at and called the frogs' dancing-master; Auenbrugger was made fun of for drumming on people; Harvey is said to have lost half of his consulting practice;--all because they were advancing ideas that their contemporaries were not ready to accept. We are rather likely to think that this intolerant attitude of mind belongs to the older times, but it is rather easy to trace it in our own. In Constantine's day men had ready to hand a very serious weapon that might be used against innovators. By craftily circulated rumors the populace was brought to accuse him of magical practices, that is, of producing his cures by association with the devil. We are rather prone to think little of a generation that could take such nonsense seriously, but it would not be hard to find analogous false notions prevalent at the present time, which sometimes make life difficult, if not dangerous, for well-meaning individuals.[10] Life seems to have been made very uncomfortable for Constantine in Carthage. Just the extent to which persecution went, however, we do not know. About this time Constantine's work attracted the attention of Duke Robert of Salerno. He invited him to become his physician. After he had filled the position for a time a personal friendship developed, and, as has often happened to the physicians of kings, he became a royal counsellor and private secretary. When the post of professor of medicine at Salerno fell vacant, it is not surprising, then, that Constantine should have been made professor, and from here his teaching soon attracted the attention of all the men of his time.