The Greek philosopher who co-founded the Cynic school along with his pupil Diogenes and who was a disciple of Gorgias was Antisthenes. Antisthenes was a philosopher who lived in the 5th century BC and was a contemporary of Socrates. He was a student of the Sophist Gorgias and is credited with being one of the founders of the Cynic school of philosophy, along with Diogenes. The Cynic school was known for its emphasis on living in accordance with nature and on the rejection of material possessions and social conventions. Antisthenes is known for his philosophy of ethics and his belief in the primacy of virtue.