Diogenes, also known as Diogenes the Cynic

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Diogenes (1882)
by John William Waterhouse

Diogenes made a virtue of poverty. He begged for a living and often slept in a large ceramic jar in the marketplace. He became notorious for his philosophical stunts, such as carrying a lamp during the day, claiming to be looking for an honest man. He criticized Plato, disputed his interpretation of Socrates, and sabotaged his lectures, sometimes distracting listeners by bringing food and eating during the discussions. Diogenes was also noted for having mocked Alexander the Great, both in public and to his face when he visited Corinth in 336.

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