The renewal of Aristotelian learning in the thirteenth century was derived less directly from classical writings than was the case with the earlier revival. From the time of Alexander onwards, various Greek schools had been founded in Syria. These schools were largely concerned with the teachings of Aristotle, which were thence handed on into Persia, Arabia and other countries. The Arabs translated the Syriac versions of Greek writers into their own language, and their physicians and philosophers kept alive the knowledge of science during the dark ages when Greece and Rome had ceased to be the homes of learning, and while culture was still in its infancy in Germany, France and England. The Arabic translations of classical writings were eventually rendered into Latin, or even sometimes into Greek again, and in this guise found their way to western Europe. Amongst other books, which suffered these successive metamorphoses, was the pseudo-Aristotelian botany of Nicolaus of Damascus, which has acquired importance in the annals of western science, because it formed the basis of the botanical work of Albertus Magnus. Albert of Bollstadt (1193-1280), Bishop of Ratisbon, was a famous scholastic philosopher. He was esteemed one of the most learned men of his age, and was called “Albertus Magnus” during his life-time, the title being conferred on him by the unanimous consent of the schools. The “Angelic Doctor,” St Thomas Aquinas, became one of his pupils. According to legendary lore the name of Albertus would have been unknown in science, but for divine intervention, which miraculously affected his career. As a boy, tradition says that he was singularly lacking in intelligence, so much so that it was feared that he would be compelled to abandon the hope of entering monastic life, since he seemed incapable even of the limited acquirements necessary. However, one night, the Blessed Virgin, touched by his fervour and piety, appeared before him in glory, and asked whether he would rather excel in philosophy or in theology. Albertus without hesitation chose philosophy. The Virgin granted his desire, but, being inwardly wounded at his choice, she added that, because he had preferred profane to divine knowledge, he should sink back, before the end of his life, into his pristine state of stupidity. According to the legend, this came to pass. Three years before his death he was suddenly struck down, in the presence of his students, and never regained his mental powers.