The century and a half that followed the defeat of Persia was one of very great splendour for the Greek civilization. True that Greece was torn by a desperate struggle for ascendancy between Athens, Sparta and other states (the Peloponnesian War 431 to 404 B.C.) and that in 338 B.C. the Macedonians became virtually masters of Greece; nevertheless during this period the thought and the creative and artistic impulse of the Greeks rose to levels that made their achievement a lamp to mankind for all the rest of history. The head and centre of this mental activity was Athens. For over thirty years (466 to 428 B.C.) Athens was dominated by a man of great vigour and liberality of mind, Pericles, who set himself to rebuild the city from the ashes to which the Persians had reduced it. The beautiful ruins that still glorify Athens to-day are chiefly the remains of this great effort. And he did not simply rebuild a material Athens. He rebuilt Athens intellectually. He gathered about him not only architects and sculptors but poets, dramatists, philosophers and teachers. Herodotus came to Athens to recite his history (438 B.C.). Anaxagoras came with the beginnings of a scientific description of the sun and stars. Æschylus, Sophocles and Euripides one after the other carried the Greek drama to its highest levels or beauty and nobility. The impetus Pericles gave to the intellectual life of Athens lived on after his death, and in spite of the fact that the peace of Greece was now broken by the Peloponnesian War and a long and wasteful struggle for “ascendancy” was beginning. Indeed the darkling of the political horizon seems for a time to have quickened rather than discouraged men’s minds. Already long before the time of Pericles the peculiar freedom of Greek institutions had given great importance to skill in discussion. Decision rested neither with king nor with priest but in the assemblies of the people or of leading men. Eloquence and able argument became very desirable accomplishments therefore, and a class of teachers arose, the Sophists, who undertook to strengthen young men in these arts. But one cannot reason without matter, and knowledge followed in the wake of speech. The activities and rivalries of these Sophists led very naturally to an acute examination of style, of methods of thought and of the validity of arguments. When Pericles died a certain Socrates was becoming prominent as an able and destructive critic of bad argument—and much of the teaching of the Sophists was bad argument. A group of brilliant young men gathered about Socrates. In the end Socrates was executed for disturbing people’s minds (399 B.C.), he was condemned after the dignified fashion of the Athens of those days to drink in his own house and among his own friends a poisonous draught made from hemlock, but the disturbance of people’s minds went on in spite of his condemnation. His young men carried on his teaching.