Socrates was a great Greek philosopher, the source of the "Socratic Method," and known for his sayings about knowing nothing and that the unexamined life is not worth living. Socrates is not believed to have written any books, but his pupil Plato showed Socrates' method of instruction in his dialogues.
In addition to the content of his teaching, Socrates is also known for drinking a cup of poison hemlock. This was how the Athenians carried out a death sentence for a capital offense. Why did the Athenians want their great thinker Socrates to die?
Read: What Was the Charge Against Socrates?