Diogenes
| Diogenes of Sinope | |
|---|---|
| Ancient Roman mosaic depicting Diogenes (2nd or 3rd century AD) | |
| Born | 413/403 BC 
 | 
| Died | 324/321 BC (aged 81 or 90) | 
| Philosophical work | |
| Era | Ancient Greek philosophy | 
| Region | Western philosophy | 
| School | Cynicism | 
| Notable students | Crates of Thebes | 
| Notable works | Politeia | 
| Notable ideas | Cosmopolitanism | 
Diogenes the Cynic, also known as Diogenes of Sinope (c. 413/403–c. 324/321 BC), was an ancient Greek philosopher and one of the founders of Cynicism. Renowned for his ascetic lifestyle, biting wit, 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 later cultural traditions.
Born to a prosperous family in Sinope, his life took a dramatic turn following a scandal involving the defacement of coinage, an event that led to his exile and ultimately his radical rejection of conventional values. Embracing a life of poverty and self-sufficiency, he became famous for his unconventional behaviours that openly challenged societal norms, such as living in a jar or wandering public spaces with a lit lantern in daylight, claiming to be looking for a man. Diogenes advocated for a return to nature, the renunciation of materialism, and introduced early ideas of cosmopolitanism by proclaiming himself a "citizen of the world". His memorable encounters, including a legendary exchange with Alexander the Great, along with various accounts of his death, have made him a lasting symbol of philosophical defiance to established authorities and artificial values.