This result was largely owing to a singular enterprise of the twelfth century with which the learned researches of Jourdain have made us familiar.[79] Scholars from other lands, such as Constantine, Gerbert, afterwards Pope Sylvester II., Adelard of Bath, Hermann, and Alfred and Daniel de Morlay, had indeed visited Spain during that age and the one which preceded it, and had, as individuals, made a number of translations from the Arabic, among which were various works in medicine and mathematics, as well as the first version of the Koran. But in the earlier half of the twelfth century, and precisely between the years 1130 and 1150, this desultory work was reduced to a system by the establishment of a regular school of translation in Toledo. The credit of this foundation, which did so much for mediæval science and letters, belongs to Don Raymon, Archbishop of Toledo and Primate of Spain. This enlightened and liberal churchman was by origin a French monk, born at Agen, whom Bernard, a previous Primate, had brought southward in his train, as he returned from a journey beyond the Pyrenees. Don Raymon associated with himself his Archdeacon, Dominicus Gundisalvus, and a converted Jew commonly known as Johannes Hispalensis or John of Seville, whom Jourdain has identified with Johannes Avendeath: this latter being in all probability his proper name. These formed the heads of the Toledo school in its earliest period, and the enterprise was continued throughout the latter half of the century by other scholars, of whom Gherardus Cremonensis the elder was probably the chief. Versions of the voluminous works of Avicenna, as well as of several treatises by Algazel and Alpharabius, and of a number of medical writings, were the highly prized contribution of the Toledo school to the growing library of foreign authors now accessible in the Latin language. It is probable that when Michael Scot left Sicily he did so with the purpose of joining this important enterprise. His movements naturally suggest such an idea, as he proceeded to Toledo, still the centre of these studies, and won, during the years of his residence there, the name by which he is best known in the world of letters, that of the chief exponent of the Arabo-Aristotelic philosophy in the West.