Speusippus
Speusippus
(spyo͞osĭp`əs), fl. 347–339 B.C., Greek philosopher; disciple and nephew of Plato, whom he succeeded as head of the AcademyAcademy,school founded by Plato near Athens c.387 B.C. It took its name from the garden (named for the hero Academus) in which it was located. Plato's followers met there for nine centuries until, along with other pagan schools, it was closed by Emperor Justinian in A.D. 529.
..... Click the link for more information. . Speusippus distinguished 10 grades of being, thereby prefiguring Neoplatonism. He held that the good is not the source of being but is its goal. One of his most significant ideas is that it is impossible to have satisfactory knowledge of anything without knowing all things besides. A portion of his writings on Pythagorean numbers has survived.