Alexadrian School (of Philosophers). This famous school arose in Alexandria (Egypt) which was for several centuries the great seat of learning and philosophy. Famous for its library, which bears the name of “Alexandrian”, founded by Ptolemy Soter, who died in 283 B.C., at the very beginning of his reign ; that library which once boasted of 700,000 rolls or volumes (Aulus Gellius); for its museum, the first real academy of sciences and arts ; for its world-famous scholars, such as Euclid (the father of scientific geometry), Apollonius of Perga (the author of the still extant work on conic sections), Nicomachus (the arithmetician); astronomers, natural philosophers, anatomists such as Herophilus and Erasistratus, physicians, musicians, artists, etc., etc. ; it became still more famous for its Eclectic, or the New Platonic school, founded in 193 A.D., by Ammonius Saccas, whose disciples were Origen, Plotinus, and many others now famous in history. The most celebrated schools of Gnostics had their origin in Alexandria. Philo Judæus Josephus, lamblichus, Porphyry, Clement of Alexandria, Eratosthenes the astronomer, Hypatia the virgin philosopher, and numberless other stars of second magnitude, all belonged at various times to these great schools, and helped to make Alexandria one of the most justly renowned seats of learning that the world has ever produced.
Source: H.P.Blavatsky - The Theosophical Glossary