Diogenes

4th-century BC Greek Cynic philosopher

Diogenes the Cynic (dy-OJ-in-eez; c. 413/403 – c. 324/321 BC), also known as Diogenes of Sinope, was an ancient Greek philosopher during the period of Classical Greece, and one of the founders of Cynicism. Renowned for his ascetic lifestyle and radical critiques of social conventions, he became a legendary figure whose life and teachings have been recounted, often through anecdote, in both antiquity and modernity. Diogenes advocated a return to nature, the renunciation of wealth, and introduced early ideas of cosmopolitanism by proclaiming himself a "citizen of the world".

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