Antisthenes was a Greek philosopher and a pupil of Socrates. Antisthenes first learned rhetoric under Gorgias before becoming an ardent disciple of Socrates. He adopted and developed the ethical side of Socrates' teachings, advocating an ascetic life lived in accordance with virtue. Later writers regarded him as the founder of Cynic philosophy.

Diogenes, also known as Diogenes the Cynic or Diogenes of Sinope, was a Greek philosopher and one of the founders of Cynicism. He was born in Sinope, an Ionian colony on the Black Sea coast of Anatolia, in 412 or 404 BC and died at Corinth in 323 BC.