Diogenes, also known as Diogenes the Cynic, was a Greek philosopher. He was one of the philosophers who originated the Cynic philosophy, a way of thinking that advocated the rejection of luxury and promoted “living in virtue”. Diogenes believed that virtue was revealed more in action than in theory. He lived a life of extreme austerity and was known to beg for a living and sleep in the marketplace without any proper bedding. He also disregarded the laws and customs of the land, owing to which he became a controversial figure. He declared himself to be a citizen of the world and refused to claim allegiance to just one place. He carried out several political stunts, the best known of which is the incident when he went around carrying a lamp during the day, claiming to look for an “honest man.” He also gained much notoriety for publicly mocking Alexander the Great. According to some sources, he was likely a student of the philosopher Antisthenes, who himself studied with Socrates. Diogenes was captured by pirates and sold into slavery. Despite this, he was able to pass on his philosophy of Cynicism to Crates.