Diogenes (/daɪˈɒdʒɪniːz/dy-OJ-in-eez; Ancient Greek: Διογένης, romanized: Diogénēs[di.oɡénɛːs]), also known as Diogenes the Cynic (Διογένης ὁ Κυνικός, Diogénēs ho Kynikós) or Diogenes of Sinope, was a Greek philosopher. Founder of cynicism.
According to Cynicism, people are reasoning animals and the purpose of life and the way to gain happiness is to achieve virtue, in agreement with nature, following one’s natural sense of reason by living simply and shamelessly free from social constraints. The Cynics (Ancient Greek: Κυνικοί, Latin: Cynici) rejected all conventional desires for wealth, power, glory, social recognition, conformity, and worldly possessions and even flouted such conventions openly and derisively in public.