"What I do not know I do not think I know". This means "I know that I know nothing". Socrates was a classical Greek (Athenian) philosopher credited as one of the founders of Western philosophy and as being the first moral philosopher of the western ethical tradition of thought. An enigmatic figure, he made no writings and is known chiefly through the accounts of classical writers writing after his lifetime, particularly his students Plato and Xenophon. Other sources include the contemporaneous Antisthenes, Aristippus, and Aeschines of Sphettos. Aristophanes, a playwright, is the only source to have written during his lifetime.
Socrates was not born into nobility and received only a basic Greek education, learning his father's stone masonry skills while still quite young.
Socrates was a short man with a snub nose and bulging eyes, according to Plato. He did not have the appearance of an Athenian Greek god.
Socrates loved to debate but he often played ignorant to gain a better idea of what others were thinking.
Socrates was sentenced to death by hemlock poisoning. His friends offered to bribe the guards so that Socrates could fell but he chose not to run. He believed that running would mean he was afraid of death, which would mean he could not be a true philosopher.