Already, in the chapter on "Great Physicians in Early Christian Times," I have pointed out that many of the teachers of the Arabs were Christian physicians. Here it is proper to emphasize the other important factor in Arabian medicine, the Jewish physicians, who influenced the great Arabian rulers, and were the teachers of the Arabs in medicine and science generally. These Christian and Jewish physicians particularly encouraged the translation of the works of the great Greek physicians and thus kept the Greek medical tradition from dying out. It is not until the end of the ninth, or even the beginning of the tenth, century that we begin to have important contributors to medicine from among the Arabs themselves. Even at this time they have distinguished rivals among Jewish physicians. Indeed these acquired such a reputation that they became the physicians to monarchs and even high ecclesiastics, and we find them nearly everywhere throughout Europe. Their success was so great that it is not surprising that after a time the vogue of the Jewish physicians should have led to jealousy of them and to the passage of laws and decrees limiting their sphere of activity. The great Jewish physician of the ninth century was Isaac Ben Soliman, better known as Isaac el Israili, and who is sometimes spoken of as d'Israeli. He was a pupil of Isaac Ben Amram the younger, probably a grandson of another Isaac Ben Amram, who, after having become famous in Bagdad, went to Cairo and became the physician of the Emir Zijadeth III. The younger Isaac established a school, and it was with him that Israeli obtained his introduction to medicine. He practised first as an oculist and then became body-physician to the Sultan of Morocco. Because of the sympathy of his character and his unselfishness he acquired great popularity. Hyrtl refers to him respectfully as "that scholarly son of Israel." Curiously enough, considering racial feeling in the matter, he never married, and when asked why he had not, and whether he did not think that he might regret it, he replied, "I have written four books through which my memory will be better preserved than it would be by descendants." The four books are his "Treatise on Fevers," his "Treatise on Simple Medicines and Ailments," a treatise on the "Elements," and a treatise "On the Urine." Besides these, we have from him shorter works, "On the Pulse," "On Melancholy," and "On Dropsy." His hope with regard to his fame from these works was fulfilled, for they were printed as late as 1515 at Leyden, and Sprengel declared them the best compendium of simple remedies and diet that we have from the Arabian times. One of his translators into Latin has called him the monarch of physicians.