Great people: Socrates.

 Socrates (Σωκράτης) was a philosopher in Ancient Greece. He was born in 470 B. C., in Athens. His parents were Sophroniscus and Phaenarete.

Socrates studied ethics, too. His era was Ancient Greek philosophy. Plato (Πλάτων), Xenophon (Ξενοφῶν), and Aristippus (Ἀρίστιππος) were students of Socrates. 

Philosopher had his own ideas, such as: Socratic paradox, Socratic method, Socratic dialogue, and etc.

Socrates had wife and children.

He died in 399 B. C. in Athens.