(c. 480 BC–406 BC) The last of the three great tragedians of classical Athens. Euripides is known primarily for having reshaped the formal structure of traditional Attic tragedy by showing strong female characters and intelligent slaves, and by satirizing many heroes of Greek mythology. His plays seem modern by comparison with those of his contemporaries, focusing on the inner lives and motives of his characters in a way previously unknown to Greek audiences.
(c. 460 BC – c. 370 BC) Democritus was the most prolific, and ultimately the most influential, of the pre-Socratic philosophers; his atomic theory may be regarded as the culmination of early Greek thought.
Protagoras (Greek: Πρωταγόρας) (ca. 490– 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato. In his dialogue Protagoras, Plato credits him with having invented the role of the professional sophist or teacher of virtue. He is also believed to have created a major controversy during ancient times through his statement that man is the measure of all things.
The Age of Pericles or Athenian Golden Age lasting roughly from the end of the Persian Wars in 448 BC to either the death of Pericles 429 BC or the end of the Peloponnesian War in 404 BC.