Plato, the great philosopher, born in Athens, of noble birth, the year Pericles died, and the second of the Peloponnesian War; at 20 became a disciple of Socrates, and passed eight years in his society; at 30, after the death of Socrates, quitted Athens, and took up his abode at Megara; from Megara he travelled to Cyrene, Egypt, Magna Græcia, and Sicily, prolonging his stay in Magna Græcia, and studying under Pythagoras, whose philosophy was then at its prime, and which exercised a profound influence over him; after ten years' wandering in this way he, at the age of 40, returned to Athens, and founded his Academy, a gymnasium outside the city with a garden, which belonged to his father, and where he gathered around him a body of disciples, and had Aristotle for one of his pupils, lecturing there with undiminished mental power till he reached the advanced age of 81; of his philosophy one can give no account here, or indeed anywhere, it was so unsectarian; he was by pre-eminence the world-thinker, and though he was never married and left no son, he has all the thinking men and schools of philosophy in the world as his offspring; enough to say that his philosophy was philosophy, as it took up in its embrace both the ideal and the real, at once the sensible and the super-sensible world (429‒347 B.C.).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Platæa * Platoff, Matvei Ivanovich, Count